I like this excerpt when I'm a little depressed, especially when I'm sitting in my "Smelly Old Cave."

From the latter half of Chapter 9 of
Mostly Harmless
by Douglas Adams

(Yes, I did type that all in)

  After an hour or two of uncommunicative silence, the old woman decided
that the solar panels had absorbed enough sunlight to run the photocopier
now and she disappeared to rummage inside her cave.  She emerged at last
with a few sheaves of paper and fed them through the machine.
  She handed the copies to Arthur.
  "This is, er, this your advice then, is it?" said Arthur, leafing through
them uncertainly.
  "No," said the old lady. "It's the story of my life.  You see, the
quality of any advice anybody has to offer has to be judged against the
quality of life they actually lead.  Now, as you look through this
document you'll see that I've underlined all the major decisions I ever
made to make them stand out.  They're all indexed and cross-referenced.
See?  All I can suggest is that if you take decisions that are exactly
opposite to the sort of decisions that I've taken, then maybe you won't
finish up at the end of your life" -- she paused, and filled her lungs for
a good shout -- "in a smelly old cave like this!"
  She grabbed up her table tennis bat, rolled up her sleeve. Stomped off
to her pile of dead goatlike things and started to set about the flies
with vim and vigor.


  The last village Arthur visited consisted entirely of extremely high
poles.  They were so high that it wasn't possible to tell, from the ground,
what was on top of them, and Arthur had to climb three before he found one
that had anything on top of it at all other than a platform covered with
bird droppings.  
  Not an easy task.  You went up the poles by climbing on the short wooden
pegs that had been hammered into them in slowly ascending spirals.
Anybody who was a less diligent tourist than Arthur would have taken a
couple of snapshots and sloped right off to the nearest bar & grill, where
you also could buy a range of particularly sweet and gooey chocolate cakes
to eat in front of the ascetics.  But, largely as a result of this, most
of the ascetics had gone now.  In fact they had mostly gone and set up
lucrative therapy centers on some of the more affluent worlds in the
Northwest ripple of the Galaxy, where the living was easier by a factor of
about 17 million, and the chocolate was just fabulous.  Most of the
ascetics, it turned out, had not known about chocolate before the took up
asceticism.  Most of the clients who came to their therapy centers know
about it all too well.
  At the top of the third pole Arthur stopped for a breather.  He was very
hot and out of breath, since each pole was about fifty or sixty feet high.
The world seemed to swing vertiginously around him, but it didn't worry
Arthur too much.  He knew that, logically, he could not die until he had
been to Stavromula Beta, and had therefore managed to cultivate a merry
attitude toward extreme personal danger.  He felt a little giddy perched
fifty feet up in the air on top of a pole, but he dealt with it by eating
a sandwich.  He was just about to embark on reading the photocopied life
history of the oracle, when he was rather startled to hear a slight cough
behind him. 
  He turned so abruptly that he dropped his sandwich, which turned
downward through the air was rather small by the time it was stopped by
the ground.
  About thirty feet behind Arthur was another pole, and, alone among the
sparse forest of about three dozen poles, the top of it was occupied.
It was occupied by an old man who, in turn, seemed to be occupied by
profound thoughts that were making him scowl.
  "Excuse me," said Arthur.  The man ignored him.  Perhaps he couldn't
hear him.  The breeze was moving about a bit.  It wasn't only by chance
that Arthur had heard the slight cough.
  "Hello?" called Arthur. "Hello!"
  The man at last glanced around at him.  He seemed surprised to see him.
Arthur couldn't tell if he was surprised and pleased to see him or just
surprised. 
  "Are you open?" called Arthur.
  The man frowned in incomprehension.  Arthur couldn't tell if he couldn't
understand or couldn't hear.
  "I'll pop over," called Arthur. "Don't go away."
  He clambered off the small platform and climbed quickly down the
spiraling pegs, arriving at the bottom quite dizzy.
  He started to make his way over to the one which the old man was sitting,
and then suddenly realized that he had disoriented himself on the way down
and didn't know for certain which one it was.
  He looked around for landmarks and worked out which was the right one.
  He climbed it. It wasn't.
  "Damn," he said. "Excuse me!" he called out to the old man again, who
was now straight in front of him and forty feet away.  "Got lost.  Be
with you in a minute."  Down he went again, getting very hot and bothered.
  When he arrived, panting and sweating, at the top of the pole that he
knew for certain was the right one, he realized that the man was, somehow
or other, mucking him about.
  "What do you want?" shouted the old man crossly at him.  He was now
sitting on top of the pole that Arthur recognized was the one that he had
been on himself when eating his sandwich.
  "How did you get over there?" called Arthur in bewilderment.
  "You think I'm going to tell you just like that what it took me forty
springs, summers and autumns of sitting on top of a pole to work out?"
  "What about winter?"
  "Don't you sit on the pole in the winter?"
  "Just because I sit up a pole for most of my life," said the man,
"doesn't mean I'm an idiot. I go south in the winter.  Got a beach house.
Sit on the chimney stack."
  "Do you have any advice for a traveler?"
  "Yes.  Get a beach house."
  "I see"
  The man stared out over the hot, dry, scrubby landscape.  From here
Arthur could just see the old woman, a tiny speck in the distance, dancing
up and down swatting flies.
  "You see her?" called the old man, suddenly.
  "Yes," said Arthur. "I consulted her in fact."
  "Fat lot she knows.  I got the beach house because she turned it down.
What advice did she give you?"
  "Do exactly the opposite of everything she's done."
  "In other words, get a beach house."
  "I suppose so," said Arthur.  "Well, maybe I'll get one."
  "Hmmm."
  The horizon was swimming in a fetid heat haze.
  "Any other advice?" asked Arthur. "Other than to do with real estate?"
  "A beach house isn't just real estate.  It's a state of mind," said the
man.  He turned and looked at Arthur.
  Oddly, the man's face was now only a couple of feet away.  He seemed in
one way to be a perfectly normal shape, but his body was sitting
cross-legged on a pole forty feet away while his face was only two feet
from Arthur's.  Without moving his head, and without seeming to do
anything odd at all, he stood up and stepped onto the top of another pole.
Either it was just the heat, thought Arthur, or space was a different
shape for him.
  "A beach house," he said, "doesn't even have to be on the beach.  Though
the best ones are.  We all like to congregate," he went on, "at boundary
conditions."
  "Really?" said Arthur.
  "Where land meets water.  Where earth meets air.  Where body meets mind.
Where space meets time.  We like to be on one side, and look at the other."
  Arthur got terribly excited.  This was exactly the sort of thing he'd
been promised in the brochure.  Here was a man who seemed to be moving
through some kind of Escher space saying really profound things about all
sorts of stuff.
  It was unnerving, though.  The man was now stepping from pole to ground,
from ground to pole, from pole to pole, from pole to horizon and back: he
was making complete nonsense of Arthur's spatial universe.  "Please stop!"
Arthur said, suddenly.
  "Can't take it, huh?" said the man.  Without the slightest movement he
was now back, sitting cross-legged, on top of the pole forty feet in front
of Arthur.  "You come to me for advice, but you can't cope with anything
you don't recognize.  Hmmm.  So we'll have to tell something you already
know but make it sound like news, eh?  Well, business as usual, I suppose."
He sighed and squinted mournfully into the distance.
  "Where you from, boy?" he then asked.
  Arthur decided to be clever.  He was fed up with being mistaken for a
complete idiot by everyone he ever met.  "Tell you what," he said.
"You're a seer.  Why don't you tell me?"
  The old man sighed again.  "I was just," he said, passing his hand
around behind his head, "making conversation."  When he brought his hand
around to the front again, he had a globe of the Earth spinning on his
up-pointed forefinger.  It was unmistakable.  He put it away again.
Arthur was stunned.
  "How did you --"
  "I can't tell you."
  "Why not?  I've come all this way."
  "You cannot see what I see because you see what you see.  You cannot
know what I know because you know what you know.  What I see and what I
know cannot be added to what you see and what you know because they are
not of the same kind.  Neither can it replace what you see and what you
know, because that would be to replace you yourself.
  "Hang on, can I write this down?" said Arthur, excitedly fumbling in his
pocket for a pencil.
  "You can pick up a copy at the space port," said the old man. "They've
got racks of the stuff."
  "Oh," said Arthur, disappointed. "Well, isn't there anything that's
perhaps a bit more specific to me?"
  "Everything you see or hear or experience in any way at all is specific
to you.  You create a universe by perceiving it, so everything in the
universe you perceive is specific to you." 
  Arthur looked at him doubtfully.  "Can I get that at the space port,
too?" he said.
  "Check it out," said the old man.
  "It says in the brochure," said Arthur, pulling it out of his pocket and
looking at it again, "that I can have a special prayer, individually
tailored to me and my special needs."
  "Oh all right," said the old man.  "Here's a prayer for you.  Got a
pencil?"
  "Yes," said Arthur.
  "It goes like this.  Let's see now: `Protect me from knowing what I
don't need to know.  Protect me from even knowing that there are things to
know that I don't know.  Protect me from knowing that I decided not to
know about the things that I decide not to know about.  Amen.'  That's it.
It's what you pray silently inside yourself anyway, so you may as well have
it out in the open."
  "Hmmm," said Arthur. "Well thank you --"
  "There's another prayer that goes with it that's very important," said
the old man, "so you'd better jot this down, too."
  "Okay."
  "It goes, `Lord, lord, lord...' It's best to put that bit in just in
case.  You can never be too sure.  `Lord, lord, lord.  Protect me from the
consequences of the above prayer.  Amen.'  And that's it.  Most of the
trouble people get into in life comes from leaving out that last part."
  "Ever heard of a place called Stavromula Beta?" asked Arthur.
  "No."
  "Well, thank you for your help," said Arthur.
  "Don't mention it," said the man on the pole, and vanished.