Let no one expect anything of certainty from astronomy, lest if anyone take as true that which has been constructed for another use, he go away...bigger fool than when he came to it.

So far as hypotheses are concerned, let no one expect anything certain from astronomy, which cannot furnish it, lest he accept as the truth ideas conceived for another purpose, and depart from this study a greater fool than when he entered it.

We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface.

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

Let no one say that he is a follower of Gandhi. It is enough that I should be my own follower. I know what an inadequate follower I am of myself, for I cannot live up to the convictions I stand for. You are no followers but fellow students, fellow pilgrims, fellow seekers, fellow workers.

No one person knows much more about writing than another. I expect that when people think they know anything about it, then their case is hopeless.