To the praise of the glory of His grace, wherein He hath made us accepted in the Beloved. – Ephesians 1:6

It should never be forgotten that we originally fell by a representative. Adam stood for us, and he was our federal head. We did not fall personally at the first, but in our representative. Had he kept the conditions of the covenant we had stood through him, but, inasmuch as he fell, we fell in him. I pray you cavil not at the arrangement, because there lay the hope of our lace. The angels probably fell individually, one by one, and hence they fell irretrievably, -there was no restoring them: but as we fell in one Adam, there remained the possibility of our rising in another Adam; and therefore, in the fulness of time God sent forth His Son Jesus Christ, born of a woman, made under the law to become the second Adam. He undertook to remove our burdens and to fulfil the conditions of our restoration. According to covenant He must appear in our nature, and that nature in the fulness of time He assumed. He must bear the penalty: that He hath done in His personal suffering and death. He must obey the law: that He has done to the utmost. And now Christ Jesus, having borne penalty and fulfilled law, is Himself justified before God, and stands forth before God as the representative of all that are in Him. God for Christ’s sake has accepted us in Him, has forgiven us in Him, and looks upon us with love infinite and changeless in Him. This is how all our blessings come to us-in and through Christ Jesus; and if we are indeed in Him, the Lord doth not only forgive us our sin, but He bestows upon us the boundless riches of His grace in Him: in fact, He treats us as He would treat His Son; He deals with us as He would deal with Jesus. Oh, how pleasant to think that when the just God looks upon us it is through the reconciling medium- He views us through the Mediator. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1448.cfm