Be unselfish. That is the first and final commandment for those who would be useful and happy in their usefulness. If you think of yourself only, you cannot develop because you are choking the source of development, which is spiritual expansion through thought for others.
“I take my work seriously but I can't take myself too seriously. I'm in such a crazy privileged position.”
“I would sum up my fear about the future in one word: boring. And that's my one fear: that everything has happened; nothing exciting or new or interesting is ever going to happen again... the future is just going to be a vast, conforming suburb of the soul.”