Verse 6. And because ye are sons. As a consequence of your being adopted into the family of God, and being regarded as his sons. It follows as a part of his purpose of adoption that his children shall have the spirit of the Lord Jesus.

The Spirit of his Son. The spirit of the Lord Jesus; the spirit which animated him, or which he evinced. The idea is, that as the Lord Jesus was enabled to approach God with the language of endearment and love, so they would be. He, being the true and exalted Son of God, had the spirit appropriate to such a relation; they being adopted, and made like him, have the same spirit. The "spirit" here referred to does not mean, as I suppose, the Holy Spirit as such; nor the miraculous endowments of the Holy Spirit, but the spirit which made them like the Lord Jesus; the spirit by which they were enabled to approach God as his children, and use the reverent, and tender, and affectionate language of a child addressing a father. It is that language used by Christians when they have evidence of adoption; the expression of the warm, and elevated, and glowing emotions which they have when they can approach God as their God, and address him as their Father.

Crying. That is, the spirit thus cries, pueuma -- krazon. Comp. See Barnes "Ro 8:26, See Barnes "Ro 8:27".

In Ro 8:15, it is, "wherewith we cry."

Abba, Father. See Barnes "Ro 8:15".

It is said in the Babylonian Gemara, a Jewish work, that it was not permitted slaves to use the title of Abba in addressing the master of the family to which they belonged. If so, then the language which Christians are here represented as using is the language of freemen, and denotes that they are not under the servitude, of sin.

{a} "Spirit of his Son" Ro 8:15,17