As the cleansing of a metal object produces a shine in it, so is the cleansing of the heart especially from 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 Abi ruh, 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, or 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.

Many know and some say that the eyes can tell everything that is in the heart of man, but fewer there are who know the cause behind it. The eyes are like the thermometer of the center in the head, which is focused to the center of the heart. Every impression that the heart bears, beautiful or ugly, is mirrored upon the center of the head, and so it is reflected accordingly in man's visage, especially in his eyes, which express the most.

There are many clever people but so few there are who may be called wise. The clever ones plot and plan one against the other and exchange evil thoughts between themselves. So those deceitful and treacherous, intoxicated by their interest in life, cover their eyes with the cover of selfishness, thus keeping the heart from showing out its light, which alone illuminates the path of every achievement in life.

It might seem hard work to empty one's heart of all bad impressions and ill feelings, of all bitterness and evil thoughts, and yet it is not nearly so hard as the task of earning one's daily bread. The work in one's everyday life takes most part of the day, the emptying the heart of undesirable things takes but a few moments silence. It is the desire of erasing from the heart every undesirable impression that enables one in time to purify one's heart.