He who has imagination without learning has wings but no feet.

Speech is but the incorporation of thought.

Old age takes from the man of intellect no qualities save those that are useless to wisdom.

The joy which is caused by truth and noble thoughts shows itself in the words by which they are expressed.

I resemble the poplar,--that tree which, even when old, still looks young.

Genuine witticisms surprise those who say them as much as those who listen to them; they arise in us in spite of us, or, at least, without our participation,--like everything inspired.

God multiplies intelligence, which communicates itself, like fire, ad infinitum. Light a thousand torches at one touch, the flame remains always the same.