8819. 'And Mount Sinai was smoking, the whole of it' means the appearance of celestial good in the greatest obscurity. This is clear from the meaning of 'Mount Sinai' as celestial good, as immediately above in 8818; and from the meaning of 'smoking' as appearance in obscurity. Obscurity is used to mean the obscurity of faith such as those belonging to the spiritual Church possess when compared with those belonging to the celestial Church, 2708 (beginning), 2715, 2718, 2831, 2935, 2937, 3241, 3833, 6289. The greatest obscurity, meant by 'Mount Sinai was smoking, the whole of it' and by the statement just below that 'its smoke went up like the smoke of a furnace', means the obscurity that clouded the understanding of the Israelite nation, before whom the appearance took place. For Jehovah or the Lord appears to everyone according to their true nature, 8788, 8814, so that He appears as love and the light of truth to those governed by good, but as an enemy and avenger to those ruled by evil. His appearance as such to the Israelite people is also clear from other places in Moses,
The appearance of the glory of Jehovah was like a devouring fire on the top of the mountain, before the eyes of the children of Israel. Exodus 24:16-17.
In the same author,
You came near and stood at the foot of 1 the mountain, and the mountain was burning with fire even to the heart of heaven; there was darkness and cloud and thick darkness. And Jehovah spoke to you out of the midst of the fire. Deuteronomy 4:11-12; 5:22.
And in the same author,
It happened, when you heard the voice out of the midst of the darkness, and the mountain was burning with fire, that you came near to Me and said, Why should we die? For this great fire will devour us; if we hear the voice of Jehovah our God any more we shall die. Deuteronomy 5:23-25.
 The reason why this should be so is that no person can help seeing God from such things as are present in himself. The person who is ruled by hatred, for example, sees Him from hatred; and one who is ruled by ruthlessness sees Him in ruthlessness. And on the other hand, the person who is governed by charity and mercy sees Him from these virtues and in them. It is like rays of light, which are converted into hideous colours when they fall on hideous forms, but into beautiful colours when they fall on beautiful forms. The meaning of 'smoke' as the obscurity of truth, and also as the thick darkness belonging to falsity, is clear in Isaiah 9:18-19; 34:9-10; Joel 2:30-31; Hosea 13:1, 3; Revelation 9:17-18; 18:2, 18; 19:3.
1. literally, stood under
(Odkazy: Exodus 19:18)