Rejoicing in hope; i.e. in hope of deliverance here in due time, and of eternal salvation hereafter: See Poole on "Rom_5:2".
Continuing instant in prayer; be instant and constant in the duty. A metaphor from hounds, that give not over the game till they have got it: see Luk_18:1Eph_6:18Col_4:21Th_5:17.