Agape and Eros
It is a commonplace amongst preachers to distinguish between the various Greek words for ‘love’ (philia, storge, eros and agape) and assert that agape is the word that fits Christian love.
There is a considerable amount of truth in this, of course. Agape, scholars inform us, was a little-used word in secular Greek and therefore was conveniently available to have Christian meaning poured into it.