Infused grace is a term often used by Catholic theologians to describe in metaphorical terms how God "pours" grace into our souls or, to put it another way, "fills" us with his grace. The word "infused" denotes the idea of something being "poured into" and is seen most commonly in the Latin formula gratia infusia. This language is symbolic, of course, but it is certainly biblical. Some Protestant critics of the Catholic Church criticize the concept of infused grace as being "unbiblical," but as the following verses show, the concept is completely biblical.
"You are the fairest of the sons of men; grace is poured upon your lips; therefore God has blessed you for ever" (Psalm 45:2).
"For the palace will be forsaken . . . until the Spirit is poured upon us from on high, and the wilderness becomes a fruitful field, and the fruitful field is deemed a forest" (Isaiah 32:14-15).
"And in the last days it shall be, God declares, that I will pour out my Spirit upon all flesh, and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams; yea, and on my menservants and my maidservants in those days I will pour out my Spirit; and they shall prophesy" (Acts 2:17-18).
"And Stephen, full of grace and power, did great wonders and signs among the people" (Acts 6:8).
"And when they had prayed, the place in which they were gathered together was shaken; and they were all filled with the Holy Spirit and spoke the word of God with boldness" (Acts 4:31).
"And the believers from among the circumcised who came with Peter were amazed, because the gift of the Holy Spirit had been poured out even on the Gentiles" (Acts 10:45).
"When he came and saw the grace of God, he was glad; and he exhorted them all to remain faithful to the Lord with steadfast purpose; for he was a good man, full of the Holy Spirit and of faith" (Acts 11:23-24).
"And hope does not disappoint us, because God's love has been poured into our hearts through the Holy Spirit which has been given to us" (Romans 5:5).
"And do not get drunk with wine, for that is debauchery; but be filled with the Spirit" (Eph. 5:18).
"He saved us, not because of deeds done by us in righteousness, but in virtue of his own mercy, by the washing of regeneration and renewal in the Holy Spirit, which he poured out upon us richly through Jesus Christ our Savior, so that we might be justified by his grace and become heirs in hope of eternal life" (Titus 3:5-7)