The error of youth is to believe that intelligence is a substitute for experience, while the error of age is to believe experience is a substitute for intelligence.

Grown people know that they do not always know the way of things, and even if they think they know, they do not know where and how they got the proof.

Genius has no youth, but starts with the ripeness of age and old experience.

Philosophers are capable of almost endless enjoyment of mutual misunderstanding.

I have lived to see that being seventeen is no protection against becoming seventy, but to know this needs the experience of a lifetime, for no imagination copes with it.

Noorus tähendab valmisolekut minna ja ära tuua kõik õnneks vajalik.