τῷ δὲ κ.τ.λ. S. Paul argues from the precise words of scripture: it was an act of faith that was met by the act of GOD. No works are mentioned, therefore no works were included in the consideration; if there had been works, the language would have expressed the act of GOD as conferring a due reward; but there is no such suggestion in the words; they clearly imply a free favour on the part of GOD.

ἐργαζομένῳ has frequently the idea of working for hire, for a living, etc.; cf. 1 Thessalonians 2:9, alibi

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Old Testament