Isaiah

“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

“When, therefore, men have slight and transient thoughts of their lusts, it is no great sign that they are mortified, or that they are in a way for their mortification. This is every man’s “knowing the plague of his own heart,” 1 Kings viii. 38, without which no other work can be done. It is to be feared that very many have little knowledge of the main enemy that they carry about with them in their bosoms”
― John Owen, Of the Mortification of Sin in Believers

“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

“But our doctrine must stand sublime above all the glory of the world, and invincible by all its power, because it is not ours, but that of the living God and his Anointed, whom the Father has appointed King, that he may rule from sea to sea, and from the rivers even to the ends of the earth; and so rule as to smite the whole earth and its strength of iron and brass, its splendour of gold and silver, with the mere rod of his mouth, and break them in pieces like a potter’s vessel; according to the magnificent predictions of the prophets respecting his kingdom (Dan. 2:34; Isaiah 11:4; Psalm 2:9).”
― John Calvin, Institutes of the Christian Religion