If we will disbelieve everything, because we cannot certainly know all
things, we shall do muchwhat as wisely as he who would not use his
legs, but sit still and perish, because he had no wings to fly.
6. Knowledge of our capacity a cure of scepticism and idleness. When
we know our own strength, we shall the better know what to undertake
with hopes of success; and when we have well surveyed the powers of
our own minds, and made some estimate what we may expect from them, we
shall not be inclined either to sit still, and not set our thoughts on
work at all, in despair of knowing anything; nor on the other side,
question everything, and disclaim all knowledge, because some things
are not to be understood. It is of great use to the sailor to know the
length of his line, though he cannot with it fathom all the depths
of the ocean. It is well he knows that it is long enough to reach
the bottom, at such places as are necessary to direct his voyage,
and caution him against running upon shoals that may ruin him. Our
business here is not to know all things, but those which concern our
conduct. If we can find out those measures, whereby a rational
creature, put in that state in which man is in this world, may and
ought to govern his opinions, and actions depending thereon, we need
not to be troubled that some other things escape our knowledge.
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