Try to describe a colour to someone who has never been able to see any colour at all. Your words will have no meaning for him, however accurate and expressive they may be. In the same way, most mystics are sceptical about the use of describing their experiences to those who have not already had some such experience. This is where the "glimpse" is of such tremendous value.
-- Notebooks Category 22: Inspiration and the Overself > Chapter 4: Introduction To Mystical Glimpses > # 101