11 Since in his prayer, and his contemplation he had frequently experienced this divine love, whereby we can be intimately united with God, there broke forth from his soul these inspired words: "Happy is the soul to whom it has been given to experience an embrace of such surpassing delight! This spiritual embrace is nothing else than a chaste and holy love, a love sweet and pleasant, a love perfectly serene and perfectly pure, a love that is mutual, intimate, and strong, a love that joins two, not in one flesh, but in one spirit, that makes two to be no longer two but one undivided spirit, as witness St. Paul, where he says, 'He who cleaves to the Lord is one spirit with Him'."
Source: Doctor Mellifluus (Vatican.va)