en_tn/eph/01/07.md

riches of his grace

Paul speaks of God's grace as if it were material wealth. AT: "greatness of God's grace" or "abundance of God's grace" (See: rc://en/ta/man/translate/figs-metaphor)

He lavished this grace upon us

"He gave us this great amount of grace" or "He was extremely kind to us"

with all wisdom and understanding

Possible meanings are 1) "because he has all wisdom and understanding" 2) "so that we might have great wisdom and understanding"