Being in love is a good thing, but it is not the best thing. There are many things below it, but there are also things above it. You cannot make it the basis of a whole life. It is a noble feeling, but it is still a feeling. Now no feeling can be relied on to last in its full intensity, or even to last at all. Knowledge can last, principles can last, habits can last; but feelings come and go.

Love as distinct from “being in love” is not merely a feeling. It is a deep unity, maintained by the will and deliberately strengthened by habit...

To be in love involves the most irresistible conviction that one will go on being in love until one dies, and that possession of the beloved will confer, not merely frequent ecstasies, but settled, fruitful, deep-rooted, lifelong happiness.

'Being in love' first moved them to promise fidelity: this quieter love enables them to keep the promise.