He is thy praise, i.e. the Object of thy praise; the Being who had given them abundant cause to praise him, and whom they were bound continually to praise (cf. Psalms 22:3; Psalms 109:1; Jeremiah 17:14).
Terrible things; acts which by their greatness and awful effects inspired fear and dread into those by whom they were witnessed. For thee; literally, with thee, i.e. either in thy view or towards thee, for thy behoof (comp.
Deuteronomy 1:30; 1 Samuel 12:7; Zechariah 7:9; and such an expression as "deal kindly [literally, do kindness] with," Genesis 24:49, etc.).