Disciplining the mind implies conflict. It implies not doing what part of you wants to do, and doing something different instead.
Purifying the mind, on the other hand, means looking at why you want to do something that has some kind of negative consequences in the first place. Once you find the source of this desire, and understand that it comes from illusory fear, the mind would not come up with such desires again. The most direct way of doing this is to genuinely ask ‘who is the ‘I’ that …’ - and finding only Consciousness.
A clear mind is a mind without contradictions, a mind that knows Source. Such a mind can only Love.
Being Truth, each thought effortlessly re-aligns with your actual experience.
Purify your mind, do not discipline it.