6:1 Brethren, if a man be overtaken in a fault, ye which are spiritual, restore such an one in the spirit of meekness; considering thyself, lest thou also be tempted.
6:6 Let him that is taught in the word communicate unto him that teacheth in all good things.
i.e. sin. (See Scofield "Romans 3:23") .
6:11 Ye see how large a letter I have written unto you with mine own hand.
6:12 As many as desire to make a fair shew in the flesh, they constrain you to be circumcised; only lest they should suffer persecution for the cross of Christ.
(Greek - auJtou' ). . .mine own hand." The apostle was, it appears from many considerations, afflicted with ophthalmia, a common disease in the East, to the point almost of total blindness (e.g.) Galatians 4:13-15 . Ordinarily, therefore, he dictated his letters. But now, having no amanuensis at hand, but urged by the spiritual danger of his dear Galatians, he writes, we cannot know with what pain and difficulty, with his own hand, in the "large letters" his darkened vision compelled him to use.
6:14 But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world.
constrain you to be circumcised
"Circumcision" stands here for externality in religion -- form rather than spirit. Colossians 2:16-23 .