In The Cloud of Unknowing, written in the fourteenth century perhaps by an English monk, the unknown author wrote about the lack of words in contemplative prayer.
"A man may know completely and ponder thoroughtly every created thing and its works, yes, and God's works, too, but not God himself. Thought cannot comprehend God. And so, I prefer to abandon all I can know, choosing rather to love him whom I cannot know. Though we cannot know him we can love him. By love he may be touched and embraced, never by thought."
William Johnston, ed., The Cloud of Unknowing (New York: Image Books, 1973) ch 6, p. 54.