He turns and discusses this on all sides, desiring to prove that what had taken place was no novelty, but had been before typified many ages ago. How then can it be otherwise than absurd for those who had been set apart so long and who had obtained freedom, willingly to subject themselves to the yoke of bondage?
Next he states another inducement to them to abide in his doctrine.
Source: Commentary on Galatians (New Advent)