Duty
Human happiness and moral duty are inseparably connected George Washington
True happiness...is not attained through self-gratification, but through fidelity to a worthy purpose Helen Keller
The only true happiness comes from squandering ourselves for a purpose William Cowper
Never mind your happiness; do your duty Will Durant
Happiness is the natural flower of duty Phillips Brooks
When we…devote ourselves to the strict and unsparing performance of duty, then happiness comes of itself Wilhelm von Humboldt
Happy [is] the man who knows his duties! Christian Furchtegott Gellert