The idea that everyone is strong enough to bear immediate contact with God is false, and conceivable only by an age that has forgotten what it means to stand in the direct ray of divine power, that substitutes religious ‘experience’ for the overwhelming reality of God’s presence. Romano Guardini, The Lord.
Also… Take care not to go up into the mountain or touch the edge of it. Whoever touches the mountain shall be put to death. Ex 19:12
You cannot see my face, for man shall not see my face and live. Ex 33:20