Lily of the valley is known for its delicate, cup-like, pure white flowers and its light and crisp fragrance. The Beloved in Song of Solomon compares herself to one of these after she has heard her lover declare how ravished he is with her. In the spiritual sense, lily speaks of purity of heart.
Song of Sol. 2:1: "I am the rose of Sharon, the lily of the valleys". Song of Sol. 2:2: "As the lily among thorns, so is my love among the daughters."