When your mind remains in pure awareness, with no thought of past or future, without being attracted by external objects or occupied by mental constructions, it will be in a state of primordial simplicity. In that state, there is no need for the iron hand of forced vigilance to immobilize your thoughts. As it is said, “Buddhahood is the natural simplicity of the mind.”
Once you have recognized that simplicity, you need to maintain that recognition with effortless presence of mind. Then you will experience an inner freedom in which there is no need to block the arising of thoughts, or fear that they will spoil your meditation.
~ Dilgo Khyentse Rinpoche