Love is as love does

M. Scott Peck says it poignantly in The Road Less Traveled:

Love is as love does. Love is an act of will -- namely, both an intention and an action. Will also implies choice. We do not have to love. We choose to love.
By stating that it is when a couple falls out of love that they may begin to really love I am also implying that real love does not have its roots in a feeling of love. To the contrary, real love often occurs in a context in which the feeling of love is lacking, when we act lovingly despite the fact that we don't feel loving.