Having predestinated us unto the adoption of children by Jesus Christ to Himself, according to the good pleasure of His will -Ephesians 1:5

Adoption follows hard upon the heels of election, and is another messenger of good tidings. Innumerable blessings come to us by this door. “Because ye are sons, God hath sent forth the Spirit of His Son into your hearts, crying, Abba, Father. Wherefore thou art no more a servant, but a son.” “Behold what manner of love the Father hath bestowed upon us, that we should be called the sons of God.” “Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when He shall appear, we shall be like Him; for we shall see Him as He is.” Sonship with God is a dignity unspeakable, and yet it is reserved for such poor dust and ashes as we are: what shall we say concerning this? Are we not swallowed up with adoring gratitude? Unto which of the angels hath He said at any time, “Thou art My son”? but this hath been said to us; and we are thus favored above all creatures that the Lord God has made. Boundless blessings are included in sonship: it is no light thing to be a child of the Lord of Hosts, the Prince of the kings of the earth. “If a son, then an heir of God through Christ.” This opens up before us far-reaching views of present covenant provision, and of future infinite bliss. To be, indeed, born into the family of God is a dignity to which the descent of an imperial prince bears no more comparison than a spark in the tinder to the sun in the heavens.- C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1021.cfm