Righteousness is a gift from God. We aren't righteous, but out of God's compassion toward us sinners He sent His Son, born of the Virgin Mary, who lived, suffered, died, and rose again. Jesus is righteous, we are unrighteous. By grace God gives us, as pure gift, the righteousness of His own Son, imputing to us Christ's righteousness. We are, therefore, declared righteous on Christ's account, as an act of Divine Mercy, because God loves us and wishes, desires, and wills that all have redemption.
Can a Christian, therefore, having fallen into total apostasy and made shipwreck of their faith later be reconciled again back to Christ? Yes, of course, the Scriptures declare the Good News of Jesus toward sinners. That the God who made earth and sea and stars, who lovingly crafted human beings in His own Divine Image and likeness wills our salvation, that's why He sent His Son, that is the biblical story: God wants to heal, restore, save, redeem His good creation. Since we are the ones who messed up and broke the world, the fixing of the world means fixing us. And so lost and estranged sinners are called and given faith through the Gospel, in Word and Sacrament God comes down and meets us with His grace and love, to give us faith, to declare us just on Christ's account, to forgive us all our sins, cleanse us, heal us, to heal us. To restore in us that which was broken. We are being conformed to the image of Christ in order that the image and likeness of God be restored to us--and the day will come when, even in our bodies we shall be made whole--the dead shall rise. And that is true not only of the sinner who has heard the Gospel for the first time and, by the grace and power of the Holy Spirit, believes; it is just as true for us who now believe when we hear the Gospel. And should we, like prodigal sons or a wayward lost lamb, curse our Father or abandon the Shepherd, we have One who not only rushes out to meet us when we show up over the horizon and clothes us again with the finest robes and embraces us, but who searches over high mountains, searches low valleys, to pick us up over His shoulders and carry us back to the safety of the sheepfold.
It is written,
"For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord." - Romans 8:38-39
The love of God does not fail.
We may throw our inheritance at God's face, like the prodigal did to his father, and we may end up dwelling in mud and filth with pigs, eating what they eat. And truly, if we remain in that we have forfeited our inheritance. But our Heavenly Father has a house, and there is a room there for us if only we return. He will rush out to meet us, rush out to clean us, rush out to clothe us. The Banquet Feast has tables, with chairs and seating, room for all who would come and be dressed for the Feast. The Lord shall clothe us with Himself (Galatians 3:27), that we abide in Him, He is the Vine, we are the branches. Remaining in Him we live, cutting ourselves off we wither and die. By grace alone He calls us, by grace alone He secures us, by grace alone He keeps us, and by grace alone we shall pass through judgment to eternal life.
There is no sinner on earth for whom the Gospel is not for.
There is no sinner who is outside God's loving compassion in Christ.
In all things it is the will and desire of God that we sinners believe, repent, and have eternal life.
From Genesis 1:1 to Revelation 22:21 that is the declaration of the entire Bible: Jesus Christ has come to save sinners and to rescue the world.
-CryptoLutheran