2. justified

3. adopted

4. set free

5. Grace and peace to you from God our Father and the Lord Jesus Christ, who gave himself for our sins to rescue us from the present evil age, according to the will of our God and Father, to whom be glory for ever and ever. Amen.

6. … when we were under age, we were in slavery under the elemental spiritual forces of the world.  But when the set time had fully come, God sent his Son, born of a woman, born under the law, to redeem those under the law, that we might receive adoption to sonship.

7. Formerly, when you did not know God, you were slaves to those who by nature are not gods.  But now that you know God – or rather are known by God – how is it that you are turning back to those weak and miserable forces?

9. … not gods
… weak and miserable forces

11. … how is it that you are turning back to those weak and miserable forces? Do you wish to be enslaved by them all over again?  You are observing special days and months and seasons and years! I fear for you, that somehow I have wasted my efforts on you.
I plead with you, brothers and sisters, become like me, for I became like you. You did me no wrong.  As you know, it was because of an illness that I first preached the gospel to you, and even though my illness was a trial to you, you did not treat me with contempt or scorn.

12. Instead, you welcomed me as if I were an angel of God, as if I were Christ Jesus himself.  Where, then, is your blessing of me now? I can testify that, if you could have done so, you would have torn out your eyes and given them to me.  Have I now become your enemy by telling you the truth?

13. Those people are zealous to win you over, but for no good
Those people are zealous to win you over, but for no good. What they want is to alienate you from us, so that you may have zeal for them.  It is fine to be zealous, provided the purpose is good, and to be so always, not just when I am with you.  My dear children, for whom I am again in the pains of childbirth until Christ is formed in you, how I wish I could be with you now and change my tone, because I am perplexed about you!

14. … spiritual forces
it’s possible

15. The Spirit clearly says that in later times some will abandon the faith and follow deceiving spirits and things taught by demons. 
Have nothing to do with godless myths and old wives’ tales; rather, train yourself to be godly Timothy 4:1-7

16. … spiritual forces
it’s serious

17.  If they have escaped the corruption of the world by knowing our Lord and Saviour Jesus Christ and are again entangled in it and are overcome, they are worse off at the end than they were at the beginning. It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them. Of them the proverbs are true: ‘A dog returns to its vomit,’ and, ‘A sow that is washed returns to her wallowing in the mud.’ Peter 2:20-22

18. … spiritual forces
In Christ

19. Christ …
He is the one we proclaim, admonishing and teaching everyone with all wisdom, so that we may present everyone fully mature in Christ. 
… that they may know the mystery of God, namely, Christ, in whom are hidden all the treasures of wisdom and knowledge.
So then, just as you received Christ Jesus as Lord, continue to live your lives in him, rooted and built up in him
Colossians 1:28-2:7