Erich Fromm

"Man is the only animal for whom his own existence is a problem which he has to solve."

"The quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel man to unfold his powers."

"To have is to consume, and to consume is to be consumed."

"Love is the only sane and satisfactory answer to the problem of human existence."

"Greed is a bottomless pit which exhausts the person in an endless effort to satisfy the need without ever reaching satisfaction."