... in every aspect of life, purity and holiness, cleanliness and refinement, exalt the human condition and further the development of man's inner reality. Even in the physical realm, cleanliness will conduce to spirituality, as the Holy Writings clearly state. And although bodily cleanliness is a physical thing, it hath, nevertheless, a powerful influence on the life of the spirit. It is even as a voice wondrously sweet, or a melody played: although sounds are but vibrations in the air which affect the ear's auditory nerve, and these vibrations are but chance phenomena carried along through the air, even so, see how they move the heart. A wondrous melody is wings for the spirit, and maketh the soul to tremble for joy. The purport is that physical cleanliness doth also exert its effect upon the human soul.
Be ye the very essence of cleanliness amongst mankind. This, truly, is what your Lord, the Incomparable, the All-Wise, desireth for you.
Cleave ye unto the cord of refinement with such tenacity as to allow no trace of dirt to be seen upon your garments.