“The mature response to the problem of existence is love.”

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

“Infantile love follows the principle: "I love because I am loved." Mature love follows the principle: "I am loved because I love." Immature love says: "I love you because I need you." Mature love says: "I need you because I love you.”

“Freedom to creat and construct, to wonder and to venture. Such freedom requires that the individual be active and responsible, not a slave or a well-fed cog in the machine . . . It is not enough that men are not slaves; if social conditions further the existence of automatons, the result will not be love of life, but love of death.”

“Immature love says: 'I love you because I need you.' Mature love says 'I need you because I love you.”

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

“Beyond the element of giving, the active characteristic of love becomes evident in the fact that it always implies certain basic elements, common to all forms of love. These are care, responsability, respect and knowledge”