Prayer is a precious way of communicating with God, it gladdens the soul and gives repose to its affections. You should not think of prayer as being a matter of words. It is a desire for God, an indescribable devotion, not of human origin, but the gift of God's grace. As Saint Paul says: we do not know how to pray as we ought, but the Spirit himself intercedes for us with sighs too deep for words.
Anyone who receives from the Lord the gift of this type of prayer possesses a richness that is not to be taken from him, a heavenly food filling up the soul. Once he has tasted this food, he is set alight by an eternal desire for the Lord, the fiercest of fires lighting up his soul.