A compound phrase from metron (measure) and pistis (faith). Paul's term for the specific portion of faith that God distributes to each believer.
In Romans 12:3, Paul instructs believers to think with 'sober judgment, in accordance with the measure of faith God has distributed to each of you.' This phrase teaches several truths: (1) Faith is a gift from God, not a human achievement. (2) Each believer receives a specific measure. (3) Self-assessment should be calibrated to one's faith, not one's ambition. (4) Different measures produce different functions in the body — all needed, none superior.