February 16

Music is produced by vibrations of air which affect the tympanum of the ear. Although music or an ordinary pleasing voice is of the physical realm, yet it has an effect upon the spirit. In the same manner, freshness and purity of the air, the atmosphere, the scenery and sweet fragrances impart joy, spirituality and comfort to the heart. Even though these are physical phenomena they have a great spiritual influence. 
(‘Abdu’l-Baha, excerpt from a talk, August 13, 1912, Dublin, Massachusetts, USA; ‘Mahmud’s Diary’)