To me the external existence of my soul is proved from my idea of activity. If I work incessantly until my death, nature will give me another form of existence when the present can no longer sustain my spirit.

The highest goal that man can achieve is amazement.

We don't get to know people when they come to us; we must go to them to find out what they are like.

To be sure, we have inherited abilities, but our development we owe to thousands of influences coming from the world around us from which we appropriate what we can and what is suitable to us.

Duty is the demand of the hour.

The mind is found most acute and most uneasy in the morning. Uneasiness is, indeed, a species of sagacity - a passive sagacity. Fools are never uneasy.

The soul of the Christian religion is reverence.