Rejoicing in hope; patient in tribulation; continuing instant in prayer; distributing to the necessity of saints; given to hospitality. Bless them which persecute you: bless, and curse not. – Romans 12:12-14

The word “instant,” as used by our translators, meant pressing, urgent, importunate, earnest. The Greek word is said to have the signification of “always applying strength in prayer,” or continuing with all your might in prayer. Our prayer is to be full of strength; “blessed is the man whose strength is in Thee.” Master Brooks saith that the word is a metaphor taken from hunting dogs, which will never give up the game till they have got it. A hunting dog when in pursuit of its victim works itself into full motion, using every limb and muscle to follow as fast as possible. If you catch a glimpse of it you will see that it throws itself forward with intense eagerness, the whole body and soul of the dog is in motion towards one object; no portion of him lingers, not so much as a glance is given to anything else, the whole creature is instant after the game which it pursues, urgently pressing, hot foot, as we say, to overtake the prey. Now, this is the way in which we are to pray.

Prayer is to be exercised in all things, for from its position in the present context we are taught that it is not without prayer that we proceed to “distribute to the necessities of the saints.” Because we have prayed for them we are ready to befriend them by deeds of love. If we have not been accustomed to pray for the brethren, we shall not be “given to hospitality”; much less shall we “bless them which persecute us.” prayer is the life-blood of duty, the secret sap of holiness, the fountain of obedience. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1480.cfm