We are to love our neighbors as ourselves – and that standard of comparison, as ourselves , is often taken as an implicit command to love ourselves. On this view, the wording not only permits self-love but commands it; it not only sanctions self-esteem but reinforces its importance. On the face of it, however, self-love in Mark 12 is merely presupposed, not advocated. To read much of the contemporary literature, evangelical and otherwise, on self-esteem is to inhabit a domain a long way removed from the second great commandment.
D.A. Carson