A person that is true to their self knows what is true for them and within them. You cannot be true to yourself and believe something is true. What is true cannot convince the mind of anything, it is for believing and accepting or rejecting ideas, not knowing truth by experience. The mind stands on the outside looking in observing, analyzing and contemplating, but only awareness knows what is true within you. You can talk all day about what you feel, but that is not the experience of it. You are only true when you are aware inwardly of the nature of the self and existence.