Christian evangelists were intimately involved in the colonial process in southern Africa. This essay distinguishes two dimensions of their historical role, each associated with a different form of power. In the domain of formal political processes, of the concrete exercise of power, the effect of the nonconformist mission to the Tswana, as elsewhere in Africa, was inherently ambiguous. However, in the domain of implicit signs and practices, of the diffuse control over everyday meaning, it instilled the authoritative imprint of Western capitalist culture. But there was a contradiction between these dimensions: while the mission introduced a new world view, it could not deliver the world to go with it. And this contradiction, in turn, gave rise to various discourses of protest and resistance. [South Africa, Tswana, colonialism, Christianity, missionaries, power, domination and resistance, historical agency and cultural discourse]