An analysis of Paul Tillich's three‐volume Systematic Theology and Pitirim A. Sorokin's The Ways and Power of Love: Types, Factors, and Techniques of Moral Transformation reveals how a metaphysical dialogue on God and love contributes to scientific and theological scholarship on altruism. This article focuses on similarities and differences in Tillich and Sorokin. Similarities include a belief in the importance of the ontological/love connection and the conclusion that a special state, ecstasy, is integral to the experience of (...) genuine love. Differences serve to complement rather than negate. For example, Tillich's recognition that ecstatic connections with the divine within finitude are fragmentary balances Sorokin's view that these ecstatic peaks are reached only by the few. The similarities give resonance and point to the overall creation, while the differences often serve as counterpoint to balance the ideas of the scientist and the theologian. (shrink)