Many things are given to us through the Holy Spirit, but they are valueless if the chief gift of charity is lacking. . . Even if all the other gifts are lacking, charity will take us to the kingdom of God. Although faith can exist without charity, only the faith that works through love can have any value. The Holy Spirit is the charity of the Father and the Son, by means of which they love each other . . . When he is given to men, he enkindles in their hearts the love of God and of their fellow men . . . It is he who teaches us to pray as we ought, making us cleave to God . . . He enlightens our minds and forms love in our hearts. All of this is the work of the Holy Spirit.
– William of St. Thierry