Isaiah

“To load it daily with all the things which shall after be mentioned, that are grievous, killing, and destructive to it, is the height of this contest. Such a one never thinks his lust dead because it is quiet, but labours still to give it new wounds, new blows every day. So the apostle, Col. iii. 5.”
― John Owen, Of the Mortification of Sin in Believers

“Still, in studying their writings, we have endeavoured to remember (1 Cor. 3:21-23; see also Augustin. Ep. 28), that all things are ours, to serve, not lord it over us, but that we axe Christ’s only, and must obey him in all things without exception. He who does not draw this distinction will not have any fixed principles in religion; for those holy men were ignorant of many things, are often opposed to each other, and are sometimes at variance with themselves.”
― John Calvin, Institutes of the Christian religion Volume v.1

“5. The promise unto this duty is life: “Ye shall live.” The life promised is opposed to the death threatened in the clause foregoing, 9“If ye live after the flesh, ye shall die;” which the same apostle expresseth, “Ye shall of the flesh reap corruption,” Gal. vi. 8, or destruction from God. Now, perhaps the word may not only intend eternal life, but also the spiritual life in Christ, which here we have; not as to the essence and being of it, which is already enjoyed by believers, but as to the joy, comfort, and vigour of it: as the apostle says in another case, “Now I live, if ye stand fast,” 1 Thess. iii. 8; — “Now my life will do me good; I shall have joy and comfort with my life;” — “Ye shall live, lead a good, vigorous, comfortable, spiritual life whilst you are here, and obtain eternal life hereafter.”
― John Owen, Of the Mortification of Sin in Believers

“Now, it being our duty to mortify, to be killing of sin whilst it is in us, we must be at work. He that is appointed to kill an enemy, if he leave striking before the other ceases living, doth but half his work, Gal. vi. 9; Heb. xii. 1; 2 Cor. vii. 1.”
― John Owen, Of the Mortification of Sin in Believers