Beware of dissipating your powers; strive constantly to concentrate them.

We talk too much. We should talk less and draw more.

With knowledge grows doubt.

Most pioneers are at the mercy of doubt at the beginning, whether of their worth, of their theories, or of the whole enigmatic field in which they labour.

He loves not who does not see the faults of the beloved as virtues.

We who didn't inherit political power nor are made to acquire riches like nothing better than that which expands and solidifies the power of the spirit.

Good children's literature appeals not only to the child in the adult, but to the adult in the child.