1 Thessalonians 1:3

work of faith--the working reality of your faith; its alacrity in receiving the truth, and in evincing itself by its fruits. Not an otiose assent; but a realizing, working faith; not "in word only," but in one continuous chain of "work" (singular, not plural, works), Th1 1:5-10; Jam 2:22. So "the work of faith" in Th2 1:11 implies its perfect development (compare Jam 1:4). The other governing substantives similarly mark respectively the characteristic manifestation of the grace which follows each in the genitive. Faith, love, and hope, are the three great Christian graces (Th1 5:8; Co1 13:13). labour of love--The Greek implies toil, or troublesome labor, which we are stimulated by love to bear (Th1 2:9; Rev 2:2). For instances of self-denying labors of love, see Act 20:35; Rom 16:12. Not here ministerial labors. Those who shun trouble for others, love little (compare Heb 6:10). patience--Translate, "endurance of hope"; the persevering endurance of trials which flows from "hope." Rom 15:4 shows that "patience" also nourishes "hope." hope in our Lord Jesus--literally, "hope of our Lord Jesus," namely, of His coming (Th1 1:10): a hope that looked forward beyond all present things for the manifestation of Christ. in the sight of God and our Father--Your "faith, hope, and love" were not merely such as would pass for genuine before men, but "in the sight of God," the Searcher of hearts [GOMARUS]. Things are really what they are before God. BENGEL takes this clause with "remembering.

— Jamieson-Fausset-Brown Commentary (public domain)