Sincerity is the foundation-stone of faith. That is, a religious individual must disregard his personal desires and seek in whatever way he can wholeheartedly to serve the public interest; and it is impossible for a human being to turn aside from his own selfish advantages and sacrifice his own good for the good of the community except through true religious faith. For self-love is kneaded into the very clay of man, and it is not possible that, without any hope of a substantial reward, he should neglect his own present material good. That individual, however, who puts his faith in God and believes in the words of God—because he is promised and certain of a plentiful reward in the next life, and because worldly benefits as compared to the abiding joy and glory of future planes of existence are nothing to him—will for the sake of God abandon his own peace and profit and will freely consecrate his heart and soul to the common good.
- ‘Abdu’l-Baha (‘The Secret of Divine Civilization’)