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 am persuaded, that if any attempt is made to improve the education of the poor, and such an unmanly spirit should guide the resolution of a society or committee for that purpose, it would render the design abortive.”