Question

What did napoleon believe to be necessary for happiness

Answer 1

“Success in life depends upon happiness, and happiness is found in no other way than through SERVICE that is rendered in a spirit of love." Napoleon Hill”

indirectly he is trying to say that the happiness can only be gain by doing hardwork and loving what we are doing.

“Happiness is found in doing, not merely possessing.”

that means you you have to do or have to shed sweat in order to get happiness in the life.