“One who does not exchange his own happiness for the suffering of others surely does not achieve Buddhahood. How could one find happiness even in the cycle of existence?

Not to mention the next life, even in this life, a desired goal of a servant who does not do his work and of a master who does not pay out the wages cannot be accomplished”

~ Pandita Shantideva (From the text Bodhicharyavatara or Introduction to the Bodhisattva’s Way of Life)