The greatest knowledge is self-knowledge. He who understands himself will understand God.
Jesus cried and said, He that believeth on me, believeth not on me, but on him that sent me. And he that seeth me seeth him that sent me. I am come a light into the world, that whosoever believeth on me should not abide in darkness. And if any man hear my words, and believe not I judge him not: for I came not to judge the world, but to save the world. He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the last day. For I have not spoken of myself; but the Father which sent me, he gave me a commandment, what I should say, and what I should speak. And I know that this commandment is life everlasting: whatsoever I speak therefore, even as the Father said unto me, so I speak.
— John 12:44-50
Without purity of soul, how can you say, I will glorify God? That light, like a morning star, which lives in the heart of every person, this light is our salvation.
— Wabana Purana Indian Wisdom
A person can transform his personality, his inner self, from the domain of suffering, and subduing into the domain which is always steady and joyful, that is, the domain of understanding his spiritual and divine essence.