One of my favorite and similar ones is from The Dalai Lama, who says something to the effect that when we are altruistic in a competitive society, we may ultimately encounter people who will believe we are motivated by other things, and out to get them, we may encounter people who will sabatoge us for our hard work, and we may find no reward in our work from our giving. He goes on to say that we should continue to do so anyway without any expectation of reward for our altuism and to do so anonymously if possible, for even if the world thinks less of us for our giving, the search and giving of honesty and integrety is ultimately what we need to give to eachother and to no one else, reguardless of their opinion.