- "To die is poignantly bitter, but the idea of having to die without having lived is unbearable."
- "Man’s main task in life is to give birth to himself."
- "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.'"