Kabir Das was a popular 15th-century Indian mystic poet and saint having written hundreds of poems. These poems, translated into English by the great Indian poet Rabindranath Tagore, were first published in 1915. Here’s one of his poems where he talks about not having any words to describe Him.

Passage

O How may I ever express that secret word?
O how can I say He is not like this, and He is like that?
If I say that He is within me, the universe is ashamed:
If I say that He is without me, it is falsehood.
He makes the inner and the outer worlds to be indivisibly one;
The conscious and the unconscious, both are His footstools.
He is neither manifest nor hidden, He is neither revealed nor unrevealed:
There are no words to tell that which He is.

Rabindranath Tagore. The Songs of Kabir. The Macmillan Company, 1915.