James 2:22

Or, "thou seest." how--rather, "that." In the two clauses which follow, emphasize "faith" in the former, and "works" in the latter, to see the sense [BENGEL]. faith wrought with his works--for it was by faith he offered his son. Literally, "was working (at the time) with his works." by works was faith made perfect--not was vivified, but attained its fully consummated development, and is shown to be real. So "my strength is made perfect in weakness," that is, exerts itself most perfectly, shows how great it is [CAMERON]: so Jo1 4:17; Heb 2:10; Heb 5:9. The germ really, from the first, contains in it the full-grown tree, but its perfection is not attained till it is matured fully. So Jam 1:4, "Let patience have her perfect work," that is, have its full effect by showing the most perfect degree of endurance, "that ye may be perfect," that is, fully developed in the exhibition of the Christian character. ALFORD explains, "Received its realization, was entirely exemplified and filled up." So Paul, Phi 2:12, "Work out your own salvation": the salvation was already in germ theirs in their free justification through faith. It needed to be worked out still to fully developed perfection in their life.

— Jamieson-Fausset-Brown Commentary (public domain)