Let me tell you again that you must be pure and help any one who comes to you, as much as lies in your power. And this is good Karma. By the power of this, the heart becomes pure (Chitta-shuddhi), and then Shiva who is residing in every one will become manifest. He is always in the heart of every one. If there is dirt and dust on a mirror, we cannot see our image. So ignorance and wickedness are the dirt and dust that are on the mirror of our hearts. Selfishness is the chief sin, thinking of ourselves first. He who thinks, “I will eat first, I will have more money than others, and I will possess everything”, he who thinks, “I will get to heaven before others I will get Mukti before others” is the selfish man. The unselfish man says, “I will be last, I do not care to go to heaven, I will even go to hell if by doing so I can help my brothers.” This unselfishness is the test of religion. He who has more of this unselfishness is more spiritual and nearer to Shiva. Whether he is learned or ignorant, he is nearer to Shiva than anybody else, whether he knows it or not. And if a man is selfish, even though he has visited all the temples, seen all the places of pilgrimage, and painted himself like a leopard, he is still further off from Shiva.
–Swami Vivekananda, “Address at the Rameswaram Temple on Real Worship”, in The Complete Works of Swami Vivekananda, Vol. 3; courtesy of Wikiquote.