I say, then, it is plain common sense that the man who has not accustomed himself to the language of heaven will be no fit inhabitant of it… The case is like that of a language or style of speaking of this world; we know well a foreigner from a native…
[S]o a habit of prayer, the practice of turning to God and the unseen world, in every season, in every place, in every emergency (let alone its supernatural effect of prevailing with God) – prayer, I say, has what may be called a natural effect, in spiritualising and elevating the soul.
A man is no longer what he was before; gradually, imperceptibly to himself, he has imbibed a new set of ideas, and become imbued with fresh principles.
– Bl. John Henry Newman, Moral effects of Communion with God, P. S. IV, 229-30