He is My true follower who, if he come to a valley of pure gold, will pass straight through it aloof as a cloud, and will neither turn back, nor pause. Such a man is, assuredly, of Me. From his garment the Concourse on high can inhale the fragrance of sanctity.... And if he met the fairest and most comely of women, he would not feel his heart seduced by the least shadow of desire for her beauty. Such an one, indeed, is the creation of spotless chastity. Thus instructeth you the Pen of the Ancient of Days, as bidden by your Lord, the Almighty, the All-Bountiful.
(Baha’u’llah, ‘Gleanings from the Writings of Bahá'u'lláh’; The Compilation of Compilations vol. I, A Chase and Holy Life)