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There is no greater satisfaction for a just and well-meaning person than the knowledge that he has devoted his best energies to the service of the good cause.

Albert Einstein (2011). “Out of My Later Years: The Scientist, Philosopher, and Man Portrayed Through His Own Words”, p.38, Open Road Media
There is no greater satisfaction for a just and well-meaning person than the knowledge that he has devoted his best energies to the service of the good cause.