People have a beautiful experience and say: "Ah, now this is it!…" And then it settles down, diminishes, gets veiled, and suddenly something quite unexpected, absolutely commonplace and apparently completely uninteresting comes before you and blocks your way. And then you say: "Ah! what is the good of having made progress if it is going to start all over again? Why should I do it? I made an effort, I succeeded, achieved something, and now it is as if I had done nothing! It is indeed hopeless." For you have no endurance.
If one has endurance, one says: "It is all right. Good, I shall begin again as often as necessary; a thousand times, ten thousand times, a hundred thousand times, if necessary, I shall begin again – but I shall go to the very end and nothing will have the power to stop me on the way."
This is most necessary. Most necessary.