The little trouble in the world that is not due to love is due to friendship.

Friends are like a pleasant park where you wish to go; while you may enjoy the flowers, you may not eat them.

It is hard to convince a high-school student that he will encounter a lot of problems more difficult than those of algebra and geometry.

I try to have no plans the failure of which would greatly annoy me. Half the unhappiness in the world is due to the failure of plans which were never reasonable, and often impossible.

A man who will not get scared on some occasions, lacks good sense.

A reasonable probability is the only certainty.

All of the troubles that some people have in life is that which they married into.