It is natural for the heart and spirit to take pleasure and enjoyment in all things that show forth symmetry, harmony, and perfection. For instance: a beautiful house, a well designed garden, a symmetrical line, a graceful motion, a well written book, pleasing garments… All things that have in themselves grace or beauty are pleasing to the heart and spirit… What is music? It is a combination of harmonious sounds. What is poetry? It is a symmetrical collection of words. Therefore, they are pleasing through harmony and rhythm. Poetry is much more effective and complete than prose. It stirs more deeply, for it is of a finer composition.
(‘Abdu’l-Bahá, A Brief Account of My Visit to Accá, p. 11-14)