The world is full of hundreds of beautiful things we can never possibly have time to discover, and there is no time to be unkind or envious or ungenerous, and no sense in enslaving the mind to the trivialities of the moment. For you can be equal to the greatness of life only by marching with it; not by seeking love but by giving it, nor seeking to be understood but learning to understand. And when it is all over, there will be an agony of remorse because one spared the effort and did not make more of that little span of opportunity; and knowing reality at last, who knows but that one will look back with unassuageable regret upon one's pitiful little faith.
When you're young, you always think you'll meet all sorts of wonderful people, that drifting apart and losing friends is natural. You don't worry, at first, about the friends you leave behind. But as you get older, it gets harder to build friendships. Too many defenses, too little opportunity. You get busy. And by the time you realize that you've lost the dearest best friend you've ever had, years have gone by and you're mature enough to be embarrassed by your attitude and, frankly, by your arrogance.