He saw also that he must work out his dreams within the circle of his
own limitations; and that his limitations were not the limitations of
his fellow workers; neither were their limitations his. He did not
know yet just where the outmost circle of his limitations lay but he
knew that it was there and that he must make no mistake when he came
to it. And this, too, is true: just to the degree that the man
recognized his limitations, the circle widened.

Also the man came to understand that there are things knowable and
things unknowable. He came to see that truest wisdom is in this: for
one to spend well his strength on the knowable things and refuse to
dissipate his intellectual vigor upon the unknowable. Not until he
began really to know things was he conscious in any saving degree of
the unknowable. He saw that those who strive always with the
unknowable beat the air in vain and exhaust themselves in their
senseless folly. He saw that to concern oneself wholly with the
unknowable is to rob the world of the things in which are its life. To
meditate much upon the unknowable is an intellectual dissipation that
produces spiritual intoxication and often results in spiritual
delirium tremens. A habitual spiritual drunkard is a nuisance in the
world. The wisdom of Ignorance is in nothing more apparent than in a
clear recognition of the unknowable.

And then the man came to regret knowing some of the things that he
knew. He came, in some things, to wish with all his heart that he had
Ignorance where he had Knowledge. He found that much of the time and
strength that he desired to spend in acquiring the knowledge that
would help him to work out his dreams, he must spend, instead, in
ridding himself of knowledge that he had already acquired. He learned
that to forget is quite as necessary as to remember and very often