Albert Barnes Commentary Colossians 1:23

"if so be that ye continue in the faith, grounded and stedfast, and not moved away from the hope of the gospel which ye heard, which was preached in all creation under heaven; whereof I Paul was made a minister." — Colossians 1:23 (ASV)

If you continue in the faith. This means in the belief of the gospel and in holy living. If this were done, they would be presented unblamable before God; if not, they would not be. The meaning is that it will be impossible to be saved unless we continue to lead lives fitting for the gospel.

Grounded. On a firm foundation. See Barnes on Ephesians 3:17, where the same word occurs.

And settled. Greek: firm; like a building that is founded on a rock (Matthew 7:25).

And be not moved away from the hope of the Gospel. That is, by the arts of philosophy and the allurements of sin.

Which was preached to every creature which is under heaven. It cannot be supposed that it was literally true that every creature under heaven had actually heard the gospel. But this may mean:

1. That it was designed to be preached to every creature, or that the commission to make it known embraced everyone, and that, as far as the provisions of the gospel are concerned, it may be said that it was a system proclaimed to all mankind. See Mark 16:15. If a vast army, or the inhabitants of a distant province, were in rebellion against a government, and a proclamation of pardon were issued, it would not be improper to say that it was made to every one of them, even though, as a matter of fact, it might not be true that everyone in the remote parts of the army or province had actually heard of it.
2. The gospel, in the time of Paul, seems to have been so extensively preached that it might be said it was proclaimed to everybody. All known countries appear to have been visited; and so zealous and laborious had the heralds of salvation been, that it might be said the message had been proclaimed to all the world (Colossians 1:6). Compare also Barnes on Matthew 24:14.

Whereof I Paul am made a minister. See Barnes on Ephesians 3:1 and Ephesians 3:2-7. Paul here pursues the same line of thought as he does in the Epistle to the Ephesians, where, after showing the exalted nature of the Redeemer and the design of the gospel, he refers to his own labors and sufferings in making it known. The object seems to be, to show that he regarded it as the highest honor to be thus entrusted with the message of mercy to mankind and considered it a privilege to suffer in that cause.