The Greek noun analogia means "proportion," "correspondence," or "right ratio." It appears once in Romans 12:6, where Paul speaks of exercising the gift of prophecy "in proportion to one's faith."
Paul's use of analogia in Romans 12:6 establishes a principle of proportional gifting and faithful exercise: prophecy must correspond to and remain consistent with the body of faith already revealed. The analogia fidei — analogy of faith — became a foundational hermeneutical principle: interpret Scripture by Scripture, always maintaining proportion with the whole counsel of God.