Arise, O God, plead thine own cause; i.e. assert thyself, show forth thy power, avenge thyself on thine enemies. Remember how the foolish man reproacheth thee daily (comp. Psalms 74:18, and see the comment ad loc.
). In the ancient world the conquest of a people was always regarded as a triumph over the people's god or gods. Naturally, insults to the god found a place in the victor's songs of triumph (see 2 Kings 19:10-13; Isaiah 10:8-11).