In the intellect, what does it intellect, what has it done? It has to tackle each layer of that impurity. One of the practices to remove the desires in the mind is moral life and karma yoga. Can't karma yoga go along with immoral life? No, it cannot. You would say why not? Because person is unethical, we do wrong things deliberately only because we cannot help it. Nobody steals, lies, murders, you know out of the goodness of their heart. Either we are scared of something and we tell a lie. A child learns to tell a lie because trouble goes away magically. If mom catches you doing something wrong, I said, did you do this?
Swami Sarvapriyananda teaches the Katha Upanishad, one of India's most revered texts which is also a part of the Vedas. It is a collection of philosophical poems representing a conversation between the sage Naciketas and Yama (god of death). They discuss the nature of Atman, Brahman and Moksha(liberation).