A little leaven leavens the whole lump.
9. A little leaven. This refers, I think, to doctrine, not to men. It guards them against the mischievous consequences which arise from corruption of doctrine, and warns them not to consider it, as is commonly done, to be a matter attended by little or no danger.
In the former part of this chapter the apostle cautions the Galatians to take heed of the judaizing teachers, who endeavoured to bring them back under the bondage of the law. He had been arguing against them before, and had largely shown how contrary the principles and spirit of those teachers were to the spirit of the gospel; and now this is as it were...
Commenting on Galatians 5:1-12
I have confidence in you through the Lord,.... Though the apostle had said many things which carried in them the appearance of roughness and severity, yet he still entertained hopes of them that they were not so far gone, but that they might be brought back again; and he here expresses his confidence of it.