This surrender will only take place when the 'I'-thought has ceased to identify with rising thoughts. While there are still stray thoughts which attract or evade your attentoin, the 'I'-thought will always be directing its attention outwards rather than inwards. The purpose of self-enquiry is to make the 'I'-thought move inwards, towards the Self. This will happen automatically as soon as you cease to be interested in any of your rising thoughts.
There are so many thoughts in the mind. Thought after thought after thought. But there is one thought that is continuous, though it is mostly sub-conscious: 'I am the body'. This is the string on which all other thoughts are threaded. Once we identify ourselves with the body by thinking this thought, maya follows. It also follows that if we cease to identify with the body, maya will not affect us anymore.
Bhagavan is always present, inside you and in front of you. If you don't cover the vision of Bhagavan with your ego, that will be enough. The ego is the 'I am the body' idea. Remove this idea and you shine as the Self.
When Bhagavan spoke like this he sometimes used the analogy of a besieged fort. If one systematically loses off all the entrances to such a fort and then picks off the occupants one by one as they try to come out, sooner or later the fort will be empty.
However, if you relax your vigilance even for a few seconds and allow new thoughts to escape and develop unchallenged, the siege will be lifted and the mind will regain some or all of its former strength.
Tayumanuvar, a Tamil saint whom Bhagavan often quoted, wrote in one of his poems: 'My Guru merely told me that I am consciousness. Having heard this, I held onto consciousness. What he told me was just one sentence, but I cannot describe the bliss I attained from holding onto that one simple sentence. Through that one sentence I attained a peace and a happiness that can never be explained in words.'
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.
If you can maintain the siege for long enough, a time will come when no more thoughts arise; or if they do, they will only be fleeting, undistracting images on the periphery of consciousness. In that thought-free state you will begin to experience yourself as consciousness, not as mind or body.