The artist may be well advised to keep his work to himself till it is completed, because no one can readily help him or advise him with it... but the scientist is wiser not to withhold a single finding or a single conjecture from publicity.

The important thing in life is to have a great aim, and the determination to attain it.

Investigate what is, and not what pleases.

God made man simple, but how he changed and got complicated is hard to say.

Woe to him who would ascribe something like reason to Chance, and make a religion of surrendering to it.

Originality provokes originality.

In praising or loving a child, we love and praise not that which is, but that which we hope for.