Émile Zola said this quote

“ Haven't I told you scores of times, that you're always beginners, and the greatest satisfaction was not in being at the top, but in getting there, in the enjoyment you get out of scaling the heights? That's something you don't understand, and can't understand until you've gone through it yourself. You're still at the state of unlimited illusions, when a good, strong pair of legs makes the hardest road look short, and you've such a mighty appetite for glory that the tiniest crumb of success tastes delightfully sweet. You're prepared for a feast, you're going to satisfy your ambition at last, you feel it's within reach and you don't care if you give the skin off your back to get it! And then, the heights are scaled, the summits reached, and you've got to stay there. That's when the torture begins; you've drunk your excitement to the dregs and found it all too short and even rather bitter, and you wonder whether it was really worth the struggle. From that point there is no more unknown to explore, no new sensations to experience. Pride has had its brief portion of celebrity; you know that your best has been given and you're surprised it hasn't brought a keener sense of satisfaction. From that moment the horizon starts to empty of all hopes that once attracted you towards it. There's nothing to look forward to but death. But in spite of that you cling on, you don't want to feel you're played out, you persist in trying to produce something, like old men persist in trying to make love, with painful, humiliating results. ... If only we could have the courage to hang ourselves in front of our last masterpiece! ”