Pour confirmer la réponse de Cinci, voici ce qu'en dit le commentaire de la Word Bible Commentary :
Paul’s rationale for the warning of the first part of v 17 is to be found in the explanatory clause of the last part of the verse: “For I bear on my body the marks of Jesus!” The term τὰ στίγματα was common in the ancient world for the marks of religious tattooing or slave branding (cf. O. Betz, “στίγμα,” TDNT 7.657–64), and some have taken from this that early Christians generally and Paul in particular bore tattoo marks or religious brands to signify that they were Christians—perhaps the Greek letter Χ for “Χριστος.” More likely, however, what Paul had in mind by his use of τὰ στίγματα here were the scars and disfigurements left on his body as the effects of his sufferings as an apostle (cf. 2 Cor 6:4–6; 11:23–30; perhaps also Gal 4:13–14). That these were physical scars and disfigurements is made clear by the phrase ἐν τῷ σώματί μου (“on my body”). And that Paul took them to be identifying marks of his Christian apostleship is suggested by the possessive genitive τοῦ Ἰησοῦ (“of Jesus”).
Longenecker, R. N. (1998). Galatians (Vol. 41, p. 299–300). Dallas: Word, Incorporated.
Dans le même sens, le commentaire de la New Interpreter's Bible :
This expression refers to the scars that he has incurred in the course of his apostolic labors. By his own testimony Paul suffered numerous floggings and beatings, and he was once stoned (2 Cor 11:23–25; cf. 2 Cor 6:4–5; Acts 14:19). Such abuse would no doubt have left his body battered and marked by scars. Experiences such as these may lie behind Paul’s reference to some sort of physical affliction that occasioned his first visit to Galatia (Gal 4:13–14). Paul interprets these bodily scars as signs of his identification with his crucified Lord. Indeed, his battered body becomes for him a visible depiction of the gospel of the cross. This is probably what he has in mind when he describes himself as “carrying in the body the putting to death (νέκρωσις nekrōsis) of Jesus, so that the life of Jesus may also be made visible in our bodies” (2 Cor 4:10).
Hays, R. B. (1994–2004). "The Letter to the Galatians". In L. E. Keck (Éd.), New Interpreter’s Bible (Vol. 11, p. 346). Nashville: Abingdon Press.