Happiness is a ball after which we run wherever it rolls, and we push it with our feet when it stops.

If we take people only as they are, then we make them worse; if we treat them as if they were what they should be, then we bring them to where they can be brought.

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.

Children, love one another, and if that is not possible-at least try to put up with one another.

Only he who finds empiricism irksome is driven to method.

Take care of your body with steadfast fidelity.

Everything is hard before it is easy.