“The man who is a pessimist before 48 knows too much; if he is an optimist after it he knows too little.”

“A man who knows how little he knows is well, a man who knows how much he knows is sick.”

“A man should know something of his own country too, before he goes abroad.”

“The wise man looks into space and does not regard the small as too little, nor the great as too big, for he knows that, there is no limit to dimensions.”

“I am an optimist, unrepentant and militant. After all, in order not to be a fool, an optimist must know what a sad place the world can be. It is only the pessimist who finds this out anew every day.”

“A pessimist is a man who has been compelled to live with an optimist.”

“A pessimist is a man who thinks all women are bad. An optimist is a man who hopes they are.”

“Every man who has thought, knows not only how little he knows, but how little every other human being knows, and how ignorant, after all, the world must be.”

“A pessimist is a man who thinks all women are bad. An optimist is one who hopes they are. ”

“Reading after a certain age diverts the mind too much from its creative pursuits. Any man who reads too much and uses his own brain too little falls into lazy habits of thinking, just as the man who spends too much time in the theater is tempted to be content with living vicariously instead of living his own life.”