This thought-form may not inaptly be compared to a Leyden jar, the coating of living essence being symbolised by the jar, and the thought energy by the charge of electricity. If the man's thought or feeling is directly connected with someone else, the resultant thought-form moves towards that person and discharges itself upon his astral and mental bodies. If the man's thought is about himself, or is based upon a personal feeling, as the vast majority of thoughts are, it hovers round its creator and is always ready to react upon him whenever he is for a moment in a passive condition. For example, a man who yields himself to thoughts of impurity may forget all about them while he is engaged in the daily routine of his business, even though the resultant forms are hanging round him in a heavy cloud, because his attention is otherwise directed and his astral body is therefore not impressible by any other rate of vibration than its own. When, however, the marked vibration slackens and the man rests after his labours and leaves his mind blank as regards definite thought, he is very likely to feel the vibration of impurity stealing insidiously upon him. If the consciousness of the man be to any extent awakened, he may perceive this and cry out that he is being tempted by the devil; yet the truth is that the temptation is from without only in appearance, since it is nothing but the natural reaction upon him of his own thought-forms. Each man travels through space enclosed within a cage of his own building, surrounded by a mass of the forms created by his habitual thoughts. Through this medium he looks out upon the world, and naturally he sees everything tinged with its predominant colours, and all rates of vibration which reach him from without are more or less modified by its rate. Thus until the man learns complete control of thought and feeling, he sees nothing as it really is, since all his observations must be made through this medium, which distorts and colours everything like badly-made glass.