“He who is certain he knows the ending of things when he is only beginning them is either extremely wise or extremely foolish; no matter which is true, he is certainly an unhappy man, for he has put a knife in the heart of wonder.”

“There is no man...however wise, who has not at some period in his youth said things, or lived a life, the memory of which is so unpleasant to him that he would gladly expunge it. And yet he ought not entirely to regret it, because he cannot be certain that he has indeed become a wise man...”

“Man no longer lives in the beginning--he has lost the beginning. Now he finds he is in the middle, knowing neither the end nor the beginning, and yet knowing that he is in the middle, coming from the beginning and going towards the end. He sees that his life is determined by these two facets, of which he knows only that he does not know them”

“There are certain things in a man's past which he does not divulge to everybody but, perhaps, only to his friends. Again there are certain things he will not divulge even to his friends; he will divulge them perhaps only to himself, and that, too, as a secret. But, finally, there are things which he is afraid to divulge even to himself, and every decent man has quite an accumulation of such things in his mind. I can put it even this way: the more decent a man is, the larger will the number of such things be.”

“He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.”

“A foolish man thinks he knows everything. A wise man knows he doesn't.”