Song of Songs 8:6-7 - The Nature Of Genuine Romantic Love
6 Put me as a sign on your heart, as a sign on your arm; love is strong as death, and wrath bitter as the underworld: its coals are coals of fire; violent are its flames. 7 Much water may not put out love, or the deep waters overcome it: if a man would give all the substance of his house for love, it would be judged a price not great enough.