As the cleansing of a metal object produces a shine in it so is the cleansing of the heart, especially from any feeling that produces humiliation. When a person thinks, "I have been wrong by acting in a certain way," "By saying a certain thing," or "By having thought something which should not have crossed my mind," he loses, so to speak, a radiance which even beams out through his countenance and which is called in Persian Ab-i-Ru, meaning "The Radiance of the Face." Every person shows from his expression his condition of heart. Therefore the innocence of the expression is the sign of the purity of heart. Man may be clever, learned, qualified, most able, he may be strong physically or even mentally, he may be wealthy, of high rank, but none of these outside things help him to retain that glow of the countenance which depends only upon the purity of heart.