“Humans need their lives to make sense and to have meaning and purpose. Lack of meaning and purpose can override both the natural pace of progression to death and the instinctive struggle for life. People may sacrifice their lives in order to achieve meaning and purpose, or they may commit suicide in order to avoid meaninglessness. The role of medicine here is to expose false beliefs for which people may sacrifice themselves, and to help find realistic meanings that make life worthwhile.”

“It was the ghost of rationality itself ... This is the ghost of normal everyday assumptions which declares that the ultimate purpose of life, which is to keep alive, is impossible, but that this is the ultimate purpose of life anyway, so that great minds struggle to cure diseases so that people may live longer, but only madmen ask why. One lives longer in order that he may live longer. There is no other purpose. That is what the ghost says.”

“For the human experience, life in the natural world seems to require the application of meaning, in order to evoke purpose.”

“Human groupings have one main purpose: to assert everyone’s right to be different, to be special, to think, feel and live in his or her own way. People join together in order to win or defend this right. But this is where a terrible, fateful error is born: the belief that these groupings in the name of a race, a God, a party or a State are the very purpose of life and not simply a means to an end. No! The only true and lasting meaning of the struggle for life lies in the individual, in his modest peculiarities and in his right to these peculiarities.”

“Life truly is what you make it. The purpose and meaning of life is the purpose and meaning that you give it.”

“Passionate hatreds can give meaning and purpose to an empty life. These people haunted by the purposelessness of their lives try to find a new content not only by dedicating themselves to a holy cause but also by nursing a fanatical grievance.”