Can a person or a thing, regarded in its solidity, avoid being seen when it comes before our eyes? The higher divine realities on the other hand, even when they are in front of us, can be perceived only with their own consent. It depends entirely on them whether they are seen or hidden. It was by grace that God revealed himself to Abraham and the other prophets. The eye of the heart itself did not allow Abraham to see God, but the grace of God was offered spontaneously to the gaze of that righteous man.