For all works and things, which are either commanded or forbidden by God and thus have been instituted by the supreme Majesty, are 'musts.' Nevertheless, no one should be dragged to them or away from them by the hair, for I can drive no man to heaven or beat him into it with a club.
Martin LutherThe priest is not made. He must be born a priest; must inherit his office. I refer to the new birth-the birth of water and the Spirit. Thus all Christians must became priests, children of God and co-heirs with Christ the Most High Priest.
Martin Luther