The king shall joy. The future is used to give the idea of continuance, "The king rejoices, and will go on rejoicing." In thy strength, O Lord; i.e. in the strength that thou puttest forth to help and protect him (comp.
Psalms 20:6). And in thy salvation how greatly shall he rejoice: God' s "salvation" had been confidently anticipated (Psalms 20:5, Psalms 20:6, Psalms 20:9), and has now been experienced.