In Psalm 34:2, this signifies praise of the Lord because He delivers people from evil who trust in Him. (The Inner Meaning of the Prophets and Psalms 284)

In Isaiah 10:15, this signifies to brag about oneself on account of falsities from one's own intelligence. (Apocalypse Revealed 847)

In Isaiah 61:6, this signifies rejoicing over the coming of the Lord to save people who are ignorant of the truth and to restore the internals of the church. (The Inner Meaning of the Prophets and Psalms 61)