Moses, in 7:143, comes the way of those who are in love, he asks for a vision but his desire is denied, he is made to suffer by being commanded to look at other than the Beloved while the mountain is able to see God. The mountain crumbles and Moses faints at the sight of God's manifestation upon the mountain. In Qushayri's words, Moses came like thousands of men who traveled great distances, and there was nothing left to Moses of Moses. In that state of annihilation from himself, Moses was granted the unveiling of the realities. From the Sufi point of view, God is the always the beloved and the wayfarer's longing and suffering lead to realization of the truths.
What had to happen for Moses to see God's manifestation upon the mountain?
The mountain crumbles