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 can't discriminate? Oh, that's ripe, coming from a straight white man. What's the matter, baby doesn't feel like he belongs? Well why don't you try a place that was set up just for you? Like the world!