What was it in the human heart that made you despise a man because he loved you?

It is salutary to train oneself to be no more affected by censure than by praise.

It is a nuisance that knowledge can only be acquired by hard work.

The highest activities of consciousness have their origins in physical occurrences of the brain, just as the loveliest melodies are not too sublime to be expressed by notes.

Conscience is the guardian in the individual of the rules which the community has evolved for its own preservation.

I don't know why it is that the religious never ascribe common sense to God.

No action is in itself good or bad, but only such according to convention.