A justification musing

We often say that if you aren’t being accused of antinomianism, then you aren’t preaching justification rightly.  True, but something else struck me:  in Galatians Paul links his doctrine of justification as opposed to the physics of the old creation (stoichea).  Galatians 5:

 But now that you have come to know God, or rather to be known by God, how can you turn back again to the weak and worthless elementary principles of the world, whose slaves you want to be once more?