"The chief difficulty is this: awareness of The One comes to us neither by knowing nor by the pure thought that discovers the other intelligible things, but by a presence transcending knowledge. When the soul knows something, it loses its unity, it cannot remain simply one because knowledge implies multiplicity. The soul then misses The One and falls into number and multiplicity.
Plotinus (born c 205 - died 270)
"Therefore we must go beyond knowledge and hold to unity. We must renounce knowing and knowable, every object of thought, even Beauty, because Beauty, too, is posterior to The One and is derived from it as, from the sun, the daylight. That is why Plato says of The One, ‘It can neither be spoken of nor written about.’ If nevertheless we speak of it and write about it, we do so only to give direction, to urge towards that vision beyond discourse, to point out the road to one desirous of seeing.