Try taking two pieces of wood and rubbing them together. Very quickly this friction generates heat, and if you continue you will soon see small flames appear – this is light.
Movement, heat and light are three steps that have their equivalent in our psychic life: movement (will, action) produces heat (feeling, love), and heat produces light (thought, understanding).
The conclusion to be made is that you must not neglect the exercises given by a spiritual teaching. When you receive knowledge, love it enough to put it into practice.
Little by little, you will feel warmth awaken in you, and you will acquire a taste for this knowledge to the point you will soon be unable to go without it. When this heat turns into light, you will receive enlightenment to help you better guide your life.