Much of Western culture—and spirituality—is based on Greek and Roman heritage.
"All men are by nature equal, made all of the same earth by one Workman; and however we deceive ourselves, as dear unto God is the poor peasant as the mighty prince." - Plato
"Those who only preoccupy themselves with their own spiritual progress and do not work for others achieve absolutely nothing. Whosoever wants to progress must sacrifice the self for others."