28 No less moving are the words which the author of the Canticle of Canticles, employing comparisons from conjugal affection, describes symbolically the bonds of mutual love by which God and his chosen people are united to each other: "As the lily among thorns, so is My love among the daughters. . .I to My beloved and My beloved to Me, who feedeth among the lilies. . .Put Me as a seal upon thy heart, as a seal upon thy arm; for love is strong as death, jealousy is hard as hell, the lamps thereof are lamps of fire and flames."(23)
Source: Haurietis Aquas (Vatican.va)