Article 1. In and for the sake of His only Son Jesus Christ, God vouchsafed to make all who are justified partakers of the grace of adoption, by which they are taken into the number and enjoy the liberties and privileges of children of God, have His name put on them, receive the spirit of adoption, have access to the throne of grace with boldness, are enabled to cry Abba, Father, are pitied, protected, provided for, and chastened by Him as by a Father, yet never cast off, but sealed to the day of redemption, and inherit the promises as heirs of everlasting salvation.
Q. What is adoption?
A. Adoption is an act of God's free grace, whereby we are received into the number, and have a right to all the privileges of the sons of God.
--The Baptist Catechism, Question 37