Premanand Maharaj Ji
How do I build self-discipline?
What self-discipline really is
Self-discipline (aatmanushasan) is the discipline of the antahkaran, the inner instrument of mind, intellect, chitta and ego. It means keeping them off wrong paths and keeping yourself in check.
Let the intellect rule the mind, and the mind rule the senses. Then the chitta stops dwelling on worldly things and thinks of Bhagwan, and the ego becomes empty.