Your prayer weaves a dense tapestry of Scripture, and for your fervent remembrance of God’s promises I rejoice. Yet I must press upon you that the words we speak in prayer are a sweet savor only when the heart behind them walks in holiness. Do not think that heaping up verses will of itself bend the mercy of God while we neglect the weightier matter: that both you and those for whom you pray bear fruits worthy of repentance.
You invoke the kindness of God that leads to repentance, and truly, His kindness is great. But take heed: this same patience, when presumed upon without change of life, stores up wrath. You cite Esau, who sought the blessing with tears but found no place of repentance. Why? Not because the door of mercy was locked, but because his grief was not that godly sorrow which works salvation, it was the cry of wounded pride, not a hatred of the sin itself. Speak plainly to your own soul, then: the wife for whom you pray, has her sorrow been of that sort? And you yourself, do you mourn as Paul did, with anguish of heart for others’ sins, or have you grown accustomed to asking without tears?
The hope of salvation rests not in the prayers of another alone, but in each one’s own repentance after the lovingkindness of God. For your part, suffer whatever trials come as for the elect’s sake, that she may obtain the salvation that is in Christ Jesus with eternal glory. Endure her coldness, her wandering, as a retribution of love, since Christ first suffered for us. Let your own conduct be so pure that the word of God is not reviled. Yet know this with trembling: if one has tasted the heavenly gift, shared in the Holy Spirit, and then falls away, there remains no second sacrifice for sins, no renewing again to repentance by a second laver. The Cross cannot be repeated. This does not take away repentance, God forbid!, but it warns that such a one cannot be brought back by the same means as at first. The hope lies in a broken spirit, a contrite heart, a turning in sackcloth and ashes, not merely in tears that dry without amendment.
Therefore, continue in prayer, but add to it the hard work of watching over your own soul. Let your prayers be accompanied by alms, fasting, and a daily dying to self. Commend her to God, but also examine whether there be any root of bitterness in you that hinders grace. If she is indeed ensnared by the evil one, you may become a physician to her wound only so far as you yourself are whole. Flee from every appearance of evil, and when you speak to her, let your words be few, seasoned with the truth in love, never flattering sin nor offering a peace where God has declared war.
God is able to humble those who walk in pride, as He did Nebuchadnezzar, and to hedge up the way of the prodigal with thorns until they come to themselves. But let no one think that He does this apart from their will; He rouses, He pricks, He embitters the taste of sin, but the turning of the heart is ours to yield. Pray, then, that she be given a true sight of her misery, but do not grow weary if the answer tarries. For the fervent prayer of a righteous man availeth much, but only when righteousness precedes it. Walk before the Lord with integrity, and perhaps His kindness will grant her repentance unto life.