New Defender's Study Bible Notes
46:2 mountains be carried. This is more than poetic imagery. The mountains were carried into the sea during the great Flood, and this will happen again in the coming tribulation period (Revelation 6:14; 16:20).
46:3 swelling therof. Selah. The first stanza of this psalm, reminding us of the awful judgment of the great Flood in ancient times, during which Noah and those in the ark were safely carried through by the same God who is our refuge and strength, ends with the contemplative pause denoted by “Selah.”