Isaiah

“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

“The contest is for our lives and souls. Not to be daily employing the Spirit and new nature for the mortifying of sin, is to neglect that excellent succour which God hath given us against our greatest enemy. If we neglect to make use of what we have received, God may justly hold his hand from giving us more. His graces, as well as his gifts, are bestowed on us to use, exercise, and trade with. Not to be daily mortifying sin, is to sin against the goodness, kindness, wisdom, grace, and love of God, who hath furnished us with a principle of doing it.”
― John Owen, The Mortification of Sin

“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