"Immature love says: 'I love you because I need you.' Mature love says 'I need you because I love you.'" - Fromm, Erich

"Humanity has advanced, when it has advanced, not because it has been sober, responsible, and cautious, but because it has been playful, rebellious, and immature." - Robbins, Tom

"When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things." - BIBLE, I Corinthians 13:11

"Youth condemns; maturity condones." - AMY LOWELL, Tendencies in Modern American Poetry

"Man's maturity: to have regained the seriousness that he had as a child at play." - FRIEDRICH NIETZSCHE, Beyond Good and Evil

"To be adult is to be alone." - JEAN ROSTAND, A Biologist's Thoughts

"One's prime is elusive. You little girls, when you grow up, must be on the alert to recognize your prime at whatever time of your life it may occur. You must live it to the full." - MURIEL SPARK, The Prime of Miss Jean Brodie

"The mark of the immature man is that he wants to die nobly for a cause, while the mark of the mature man is that he wants to live humbly for one." - WILHELM STEKEL, quoted by J.D. Salinger in The Catcher in the Rye

"Maturity is a high price to pay for growing up." - TOM STOPPARD, Where Are They Now?

"When I can look Life in the eyes,
Grown calm and very coldly wise,
Life will have given me the Truth,
And taken in exchange - my youth."
- SARA TEASDALE, Wisdom