We turn from our own RIGHTEOUSNESS. Before conversion, man seeks to cover himself with his own fig-leaves, and to make himself acceptable with God, by his own duties. He is apt to trust in himself, and set up his own righteousness, and to reckon his pennies for gold, and not to submit to the righteousness of God. But conversion changes his mind; now he counts his own righteousness as filthy rags. He casts it off, as a man would the verminous tatters of a nasty beggar. Now he is brought to poverty of spirit, complains of and condemns himself; and all his inventory is, ‘I am poor, and miserable, and wretched, and blind, and naked!’ [Rev 3:17]. He sees a world of iniquity in his holy things, and calls his once-idolized righteousness but filth and loss; and would not for a thousand worlds be found in it!
Now he begins to set a high price upon Christ’s righteousness. He sees the need of Christ in every duty, to justify his person and sanctify his performances; he cannot live without Him; he cannot pray without Him. Christ must go with him, or else he cannot come into the presence of God; he leans upon Christ, and so bows himself in the house of his God. He sets himself down for a lost undone man without Him; his life is hid in Christ, as the root of a tree spreads in the earth for stability and nourishment. Before, the gospel of Christ was a stale and tasteless thing; but now—how sweet is Christ! Augustine could not relish his once-admired Cicero, because he could not find in his writings the name of Christ. How emphatically he cries, ‘O most sweet, most loving, most kind, most dear, most precious, most desired, most lovely, most fair!’ all in a breath, when he speaks of and to Christ. In a word, the voice of the convert is, with the martyr, ‘None but Christ!’
Excerpt from Alarm to the Unconverted by Joseph Alleine, 1671