Paul appealed next to his past contacts with the Galatians and called on them to remember his visits to Galatia to move them to abandon nomism. [source][source][source]
"If the reader is inclined to think Paul has been impersonal in dealing with the problems at Galatia, that he has been arguing as a scholar and not as a pastor, the present passage should disabuse him of this idea." [1][source]
"What we have in this personal aside is a poignant witness to the indissoluble linkage between theological content and pastoral concern. All true theology worthy of the name is pastoral theology." [2][source]
"Rhetorically, a major shift in Paul"s argument occurs at Galatians 4:12. There are, of course, still elements of forensic rhetoric to be found in what follows, particularly in Paul"s accusations against the errorists ( Galatians 4:17; Galatians 5:7-12; Galatians 6:12-13) and his statements of self-defense ( Galatians 4:13-16; Galatians 5:11; Galatians 6:14; Galatians 6:17). But the dominant tone from Galatians 4:12 onwards is that of deliberative rhetoric, not forensic rhetoric. Deliberative rhetoric, rather than taking a judicial or defensive stance, seeks to exhort or dissuade an audience regarding future actions by demonstrating that those actions are expedient or harmful ... In Galatians 4:12 ff. Paul is no longer so much concerned to accuse or defend as to persuade his Galatian converts to adopt a certain course of action." [3][source]