A speech belongs half to the speaker and half to the listener.

Take care that old age does not wrinkle your spirit even more than your face.

After a tongue has once got the knack of lying, it is not to be imagined how impossible almost it is to reclaim it. Whence it comes to pass, that we see some men, who are otherwise very honest, so subject to this vice.

Disappointment and feebleness imprint upon us a cowardly and valetudinarian virtue.

Whenever a new finding is reported to the world people say - It is probably not true. Later on, when the reliability of a new finding has been fully confirmed, people say - OK, it may be true but it has no real significance. At last, when even the significance of the finding is obvious to everybody, people say - Well, it might have some significance, but the idea is not new.

Things seem greater by imagination than they are in effect.

There is a plague on Man, the opinion that he knows something.