When your questioning goes deeper and deeper you will get no answer until finally you will reach a cul-de-sac, your thinking totally checked. You won't find anything within that can be called "I" or "Mind". But who is it that understands all this? Continue to probe more deeply yet and the mind that perceives there is nothing will vanish; you will no longer be aware of questioning but only of emptiness. When awareness of even emptiness disappears, you will realize that there is no Buddha outside Mind and no Mind outside Buddha. Now for the first time you will discover that when you do not hear with your ears you are truly hearing and when you do not see with your eyes you are really seeing Buddhas of the past, present and future. But don't cling to any of this, just experience it for yourself.

(Thomas Merton quoted Bassui)