Romans 4:4

He proceeds to prove, that Abraham was not justified by works, but by faith, and free grace, and so had no cause of boasting. This he illustrates by a comparison betwixt one that worketh, and one that worketh not, but believeth. To him that worketh; i.e. to him that worketh with a design or intent to obtain or merit justification by his works, for else he that believeth also worketh; only he is said not to work, secundum quid, after a sort, to the end or intent that he might merit by it. Is the reward not reckoned of grace, but of debt; he speaks this by way of supposition, in case he should have fulfilled the condition of perfect obedience: and yet, to speak properly, there is no reward, as a due debt from God to him that worketh, Romans 11:35; only he speaks after the manner of men, and useth a civil maxim, taken from human affairs.