"Do you know I've been sitting here thinking to myself: that if I didn't believe in life, if I lost faith in the woman I love, lost faith in the order of things, were convinced in fact that everything is a disorderly, damnable, and perhaps devil-ridden chaos, if I were struck by every horror of man's disillusionment -- still I should want to live. Having once tasted of the cup, I would not turn away from it till I had drained it! At thirty though, I shall be sure to leave the cup even if I've not emptied it, and turn away -- where I don't know. But till I am thirty I know that my youth will triumph over everything -- every disillusionment, every disgust with life. I've asked myself many times whether there is in the world any despair that could overcome this frantic thirst for life. And I've come to the conclusion that there isn't, that is until I am thirty."
Fyodor Dostoyevsky (The Brothers Karamazov)