174. But whether in this place one understands the Fount to be the Father or the Son, we certainly do not understand a fount of that water which is created, but the Fount of that divine grace, that is, of the Holy Spirit, for He is the living water. Wherefore the Lord said: “If thou knowest the gift of God, and Who He is that saith to thee, Give me to drink, thou wouldst have asked Him, and He would have given thee living water.” S. John iv. 10.