A strong determination to pursue enquiry in this way will dissolve all doubts. By questioning 'Who am I?' and by constantly meditating, one comes to the clarity of being. As long as vasanas continue to exist they will rise and cover the reality, obscuring awareness of it. As often as you become aware of them, question, 'To whom do they come?' This continuous enquiry will establish you in your own Self and you will have no further problems. When you know that the snake of the mind never existed, when you know that the rope of reality is all that exists, doubts and fears will not trouble you again.
Go deeply into this feeling of 'I'. Be aware of it so strongly and so intensely that no other thoughts have the energy to arise and distract you. If you hold this feeling of 'I' long enough and strongly enough, the false 'I' will vanish, leaving only the unbroken awareness of the real, immanent 'I', consciousness itself.
Mind is only a collection of thoughts and the thinker who thinks them. The thinker is the 'I'-thought, the primal thought which rises from the Self before all others, which identifies with all other thoughts and says, 'I am this body'. When you have eradicated all thoughts except for the thinker himself by ceaseless enquiry or by refusing to give them any attention, the 'I'-thought sinks into the Heart and surrenders, leaving behind it only an awareness of consciousness.