This is the most profound spiritual truth I know: that even when we're most sure that love can't conquer all, it seems to anyway. It goes down into the rat hole with us, in the guise of our friends, and there it swells and comforts. It gives us second winds, third winds, hundredth winds.
The fatigue of the climb was great but it is interesting to learn once more how much further one can go on one's second wind. I think that is an important lesson for everyone to learn for it should also be applied to one's mental efforts. Most people go through life without ever discovering the existance of that whole field of endeavor which we describe as second wind. Whether mentally or physically occupied most people give up at the first appearance of exhaustion. Thus they never learn the glory and the exhilaration of genuine effort...
When you undertake a daunting task, an adventure bigger than you ever thought you'd take on, you don't get to know what challenges the universe will present to you on the way. You can decide where you will go and how much money you'll spend and what your activities will be, but there will always be something unexpected, a hurdle of sorts, that offers you an opportunity to learn something about yourself if you take it in stride.