174 Saint Ambrose recommended drinking deeply of Christ, “in order that the spring of water welling up to eternal life may overflow in you”. Marius Victorinus was convinced that the Holy Spirit has given of himself in such abundance that, “whoever receives him becomes a heart that pours forth rivers of living water”. Saint Augustine saw this stream flowing from the believer as benevolence. Saint Thomas Aquinas thus maintained that whenever someone “hastens to share various gifts of grace received from God, living water flows from his heart”.
Source: Dilexit Nos (Vatican.va)