St. Gregory the Theologian

When the most sacred Body of Christ is received and eaten in a proper manner, it becomes a weapon against those who war against us, it returns to God those who had left Him, it strengthens the weak, it causes the healthy to be glad, it heals sicknesses, and it preserves health. Through it we become meek and more willing to accept correction, more longsuffering in our pains, more fervent in our love, more detailed in our knowledge, more willing to do obedience, and keener in the workings of the charismata of the Spirit. But all the opposite happens to those who do not receive Communion in a proper manner. - St. Gregory the Theologian