Earn your success based on service to others, not at the expense of others.
Service to others is the rent you pay for your room here on earth.
Being of service to others is what brings true happiness.
In refugee camps around the world, I met people who were gone. They were still walking around but had lost so much that they were unable to claim any sort of identity. Others I met found who they truly were, and they generally found it through service to others. They became teachers when there was no school, books or pencils.
The most important service to others is service to those who are not like yourself.