"The happiness of your life depends upon the quality of your thoughts."

"Wealth consists not in having great possessions, but in having few wants."

"Difficulties strengthen the mind, as labor does the body."

"The soul is stronger than its surroundings."

"No man is free who is not master of himself."

"He who is brave is free."

"Waste no more time arguing about what a good man should be. Be one."

"Man conquers the world by conquering himself."

"It’s not what happens to you, but how you react to it that matters."

"Philosophy begins in wonder."

"There are no facts, only interpretations."

"The philosophers have only interpreted the world; the point, however, is to change it."

"In the depth of winter, I finally learned that within me there lay an invincible summer."

"Beauty in things exists in the mind which contemplates them."

"Luck is what happens when preparation meets opportunity."

"Do not spoil what you have by desiring what you have not."

"You have power over your mind – not outside events. Realize this, and you will find strength."

"He who knows, does not speak. He who speaks, does not know."

"The more you struggle to live, the less you live. Give up the notion that you must be sure of what you are doing."

"Judge a man by his questions rather than by his answers."

"The heart has its reasons which reason knows nothing of."

"I think, therefore I am."