In The Meaning of Marriage (Dutton, 2011), Tim Keller argues that at the core of marriage is the covenant – a binding promise of lifelong faithfulness. He then explains that the very act of making this promise helps the couple keep that promise. He shows this by quoting Christian theologian and ethicist Lewis Smedes, who offers these words on how our identity is shaped by the promises we make:
“Some people ask who they are and expect their feelings to tell them. But feelings are flickering flames that fade after every fitful stimulus. Some people ask who they are and expect their achievements to tell them. But the things we accomplish always leave a core of character unrevealed. Some people ask who they are and expect visions of their ideal self to tell them. But our visions can only tell us what we want to be, not what we are” (90).
Keller then connects identity to marital love, and even quotes the great political theorist Hannah Arendt (confirming that he is an intellectual’s intellectual):
“It is our promises that give us a stable identity, and without a stable identity, it is impossible to have stable relationships. Hannah Arendt wrote, ‘Without being bound to the fulfillment of our promises, we would never be able to keep our identities; we would be condemned to wanter helplessly and without direction in the darkness of each person’s lonely heart, caught in its contradictions and equivocalities.'” (91)