Charles H. Spurgeon on Psalms 114:4

The mountains skipped like rams, etc. The figure drawn from the lambs and rams would appear to be inferior to the magnitude of the subject. But it was the prophet's intention to express in the homeliest way the incredible manner in which God, on these occasions, displayed his power. The stability of the earth being, as it were, founded on the mountains, what connection can they have with rams and lambs, that they should be agitated, skipping hither and thither? In speaking in this homely style, he does not mean to detract from the greatness of the miracle, but more forcibly to engrave these extraordinary tokens of God's power on the illiterate. —John Calvin.