83 Faith is the substantiation of invisible things (Heb. 11:1). It is by faith that we substantiate all the things Christ has accomplished for us. Through such a substantiating ability, we have been saved by grace. The free action of God's grace saved us through our substantiating faith. This faith of ours is the faith by which we believe in Christ, and it is Christ in us as our faith (see note 221 in Rom. 3).