Ambrose: If anyone therefore desires to behold this image of God, he must love God so as to be loved by him, no longer as a servant but as a friend who observes his commandments, that he may enter the cloud where God is. (333-397 AD)
Starting with chapter 19, Moses makes several trips up and down the mountain. Just to clear away the Charlton Heston mistake, the first time the Ten Commandments, and others, were given, Moses and all the people were standing on the plain just outside the camp. They were not burned into stone.
But the mountain is what we are considering today. In Exodus, God descends to the mountain and Moses (with others at different times) ascends the mountain. We could say they met half-way except that God was already with them. In Psalms, we are to go to God at His Mountain. In Matthew, Jesus went up the mountain to talk with Moses and Elijah, kind of reversing the roles from the Exodus account. Finally, Peter comments on what he heard on that same mountain when he, James and John were invited along.
What does it take for us to ‘enter the cloud where God is’? The scriptures tell us that Jesus had 120 faithful disciples, 12 of whom he appointed apostles. Yet, when it was time to climb the mountain of God, he invited 3. Why? They were ready; they had grown in their faith and could look upon the heavenly body of the Messiah without dying.
Consider what it would do to look upon Perfection with sinful eyes; to feel the heat of Truth on our false flesh. I want to be ready to go to the Mountain of God, but for me and most of us, it might be best to do it after we have given up these bodies.
Be righteous and do good.