Since the seventeenth century, prophets have reappeared periodically among the Wa and Lahu ethnic groups of mainland Southeast Asia. Exceptionally talented, these men built on the syncretic cults of runaway soldiers, secretive Buddhist sects, and Christian missionaries and became leaders of millenarian movements. Typically, in the Wa language, such leaders are said to be very strong and blessed, or full of grace (bwan). The prophets might be understood as reincarnations of mythical ‘men of prowess’ or as the representatives of the peripheral situation. However, both interpretations fundamentally misread the semantics of grace in Wa and neighbouring languages: a kind of cunning and strength that is so radical that it cannot be measured or mediated. Grace, here, is neither a ‘mediative concept’ (as Pitt-Rivers suggested), nor is it the consequence of Christian conversion. Instead, grace is the incommensurability that emerges at the margin of a world that is being measured.