Isaiah

“Sin sets its strength against every act of holiness, and against every degree we grow to. Let not that man think he makes any progress in holiness who walks not over the bellies of his lusts. He who doth not kill sin in this way takes no steps towards his journey’s end. He who finds not opposition from it, and who sets not himself in every particular to its mortification, is at peace with it, not dying to it.”
― 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

“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

“Alas!’ he said, ‘that these evil days should be mine, and should come in my old age instead of that peace which I have earned. Alas for Boromir the brave! The young perish and the old linger, withering.”
― J.R.R. Tolkien, The Two Towers