The visible Church is administered by men. If, then, the Church were composed only of regenerate individuals, it would be necessary for its ministers, or for the Church itself, to be able to read the very hearts of its members and to be absolutely infallible in their judgments concerning men’s internal state…nowhere has Christ promised to the Church or to any individual the gift of probing men’s hearts in order to decide whether the regeneration  of grace has been effective in them or not, and if so to what degree. Pierre Marcel