While John S. Mbiti (1931–2019) is highly acclaimed for his scholarly contributions to the fields of African religion and philosophy, little attention has been paid to his reflections on African Christian spirituality. Arguing vehemently against “imported Christianity,” he contends that only a genuine encounter between African religiosity and the Christian faith will quench the spiritual thirst of African peoples. This essay identifies and explores a few key contributions Mbiti offers in this regard and outlines certain critiques of his work. The central argument is that like the tremendous resource of Africa’s vast aquifers, African religiosity is a deep, enduring reservoir for enriching the understanding and experience of African Christian spirituality. Examples of the wellsprings of African religiosity that African Christian spirituality draws from include prayer, a unified worldview that does not erect dichotomies between the physical and spiritual realms, and a deeply communal orientation. Mbiti also underlines that certain elements within African religion require discernment in light of the gospel, so that Africans’ prior religious experience might be transposed into the fullness of life in Christ. Thus, African Christian spirituality can enhance not only the faith experience of African believers, but also followers of Jesus throughout the world who seek to deepen their spiritual lives.