A.T. Robertson Commentary Romans 12:3

"For I say, through the grace that was given me, to every man that is among you, not to think of himself more highly than he ought to think; but to think as to think soberly, according as God hath dealt to each man a measure of faith." — Romans 12:3 (ASV)

Not to think of himself more highly than he ought to think (μη υπερφρονειν παρ' ο δε φρονειν). Indirect negative command after λεγω (I say). Play on the two infinitives φρονειν, to think, and υπερφρονειν (old verb from υπερφρων, over-proud, here only in N.T.) to "over-think" with παρ' ο (beyond what) added. Then another play on φρονειν and σωφρονειν (old verb from σωφρων, sober-minded), to be in one's right mind (2 Corinthians 5:13). Self-conceit is here treated as a species of insanity.

A measure of faith (μετρον πιστεως). Accusative case, the object of the verb εμερισεν. Each has his gift from God (1 Corinthians 3:5; 1 Corinthians 4:7). There is no occasion for undue pride.

To each man (εκαστω). Emphatic position before ως (as) and emphasizes the diversity.