so that he may establish your hearts blameless in holiness before our God and Father, at the coming of our Lord Jesus with all his saints.
13 That he may confirm your hearts. He employs the term hearts here to mean conscience, or the innermost part of the soul; for he means that a man is acceptable to God only when he brings holiness of heart; that is, not merely external, but also internal.
In these words we have the earnest prayer of the apostle. He desired to be instrumental in the further benefit of the Thessalonians; and the only way to be so while at a distance was by prayer for them, together with his writing or sending to them.
Commenting on 1 Thessalonians 3:11-13
To the end he may stablish your hearts,.... Which are very unstable and inconstant in their frames, and in the exercise of grace, and have need to be established in the love of God, against the fears of men, the frowns of the world, the temptations of Satan, and in, and with the doctrines of grace; See Gill on Th1 3:2, unblamable in holiness before God, even our Father.