Young men, I beseech you earnestly, beware of pride. Two things are said to be very rare sights in the world— one is a young man that is humble, and the other is an old man that is content. I fear that this is only too true.

It is not the young man who should be considered fortunate but the old man who has lived well, because the young man in his prime wanders much by chance, vacillating in his beliefs, while the old man has docked in the harbor, having safeguarded his true happiness.

Young men should prove theorems, old men should write books.

Don’t call me your old man if you don’t prove your loyalty.