"The most common deception is when a person deceives himself; the next most common is when he deceives others; the least common is when he deceives himself into believing that he is deceiving others."

"Purity of heart is to will one thing."

"The objective truth is not for me, for I am a subject, and as a subject I must exist."

"The more a person has developed his mind, the more he is capable of being depressed."

"The only thing I am afraid of is that I shall not remain a humorist."