Romans 6:6

knowing this, that our old man was crucified with him, that the body of sin might be done away, that so we should no longer be in bondage to sin;

'Knowing this' -'this we know' (Wey); 'Since we realize' (Lenski p. 400). Paul further enlarges upon the idea of death to sin by reminding us that as Christians "our old man was crucified with Christ."

'Old man' -our old disposition, the old self, what we were before we became Christians. 'The man we once were' (NEB). (Ephesians 4:22; Colossians 3:5). In these verses it is clear that the 'old man' is the disposition, frame of mind, that gave rise and allowed all our former evil practices.

'Crucified with him' -dying to sin, changing, repentance, killing the old self IS PAINFUL!

Modern Application: At times you will hear Christians talk about. 'good moral non-Christian friend' they are trying to convert. Often people will say about such. person, 'well all they have to do is get baptized'. That's all? They don't need to 'change' anything else? Brethren, 'killing the old man', means putting to death the frame of mind that 'lives for self'. Being crucified with Christ means, living my life for Him, not self. (Galatians 2:20; 2 Corinthians 5:14)

'that the body of sin might be done away' -and why was the 'old man' put to death?

'body of sin' -is the 'house' that the old man lived in. The 'flesh' or 'body' is called the 'body of sin' or 'sinful flesh' (Romans 8:3), because it is often used as the instrument of sin, many offer their bodies as servants to sin. (Romans 6:13). When. was outside of Christ, my body was the tool and servant of sin. When. became. Christian my body became. tool for Christ (Romans 6:13; 1 Corinthians 6:19). To say that the 'flesh' is inherently sinful, would be to call Jesus. sinner. (John 1:14)

'should no longer be in bondage to sin' -Note: Paul isn't talking about only those who formerly wallowed in sin. Anyone that sinned was in bondage to sin. (John 8:34) Sin has ceased to be my Master when it has lost control of my mind and body. And we make that choice! (Romans 6:12-13)