Adoption: The Spirit and the Cry – Charles Spurgeon (historic sermon 1834-1892)
"And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father."—Galatians 4:6. We do not find the doctrine of the Trinity in Unity set forth in Scripture in formal terms, such as those which are employed in the Athanasian creed; but the truth is continually taken for