The maturity of man — that means, to have reacquired the seriousness that one had as a child at play.
Maturity is simply the process of discovering that everything you believed in when you were young is false and that all the things you refused to believe in turn out to be true.
Maturity is a bitter disappointment for which no remedy exists, unless laughter can be said to remedy anything.
I have lived a great deal among grown-ups. I have seen them intimately, close at hand. And that hasn’t much improved my opinion of them.[translation by Katherine Woods]
A mature person is one who does not think only in absolutes, who is able to be objective even when deeply stirred emotionally, who has learned that there is both good and bad in all people and all things, and who walks humbly and deals charitably with the circumstances of life, knowing that in this world no one is all-knowing and therefore all of us need both love and charity.