Abstract This chapter focuses on agape as a sentiment that nourishes and sustains human ethical life in such a way that it fosters the growth of concrete reasonableness—especially the ideal of justice—in human communities. It introduces agape as a cosmological power of evolution in Charles Peirce’s architectonic and then argues that, in the case of human agency, it is a sentiment that propels and guides ethical life. This sentiment allows creative, loving agents (1) to cherish the freedom of their beloved to choose their own ends and (2) to help their beloved grow toward those ends. The chapter explains the relationship between eros and agape, the role of self-control in loving activity, the communal environment in which agape operates, and creative love’s contribution to the growth of loving reasonableness in human communities, focusing primarily on the ideal of justice as harmony.