Calvin on the Fear of God

19. Thou wilt then say, etc. In the person of the Gentiles he brings forward what they might have pleaded for themselves; but that was of such a nature as ought not to have filled them with pride, but, on the contrary, to have made them humble. For if the cutting off of the Jews was through unbelief, and if the ingrafting of the Gentiles was by faith, what was their duty but to acknowledge the favor of God, and also to cherish modesty and humbleness of mind? For it is the nature of faith, and what properly belongs to it, to generate humility and fear. But by fear understand that which is in no way inconsistent with the assurance of faith; for Paul would not have our faith to vacillate or to alternate with doubt, much less would he have us to be frightened or to quake with fear.

Of what kind then is this fear? As the Lord bids us to take into our consideration two things, so two kinds of feeling must thereby be produced. For he would have us ever to bear in mind the miserable condition of our nature; and this can produce nothing but dread, weariness, anxiety, and despair; and it is indeed expedient that we should thus be thoroughly laid prostrate and broken down, that we may at length groan to him; but this dread, derived from the knowledge of ourselves, keeps not our minds while relying on his goodness, from continuing calm; this weariness hinders us not from enjoying full consolation in him; this anxiety, this despair, does not prevent us from obtaining in him real joy and hope. Hence the fear, of which he speaks, is set up as an antidote to proud contempt; for as every one claims for himself more than what is right, and becomes too secure and at length insolent towards others, we ought then so far to fear, that our heart may not swell with pride and elate itself. - John Calvin, commenting on Romans 11:19