The first thing necessary in seeking to understand this law is to analyse prayer itself, for the word is used to cover various activities of the consciousness, and prayers cannot be dealt with as though they formed a simple whole. There are prayers which are petitions for definite worldly advantages, for the supply of physical necessities--prayers for food, clothing, money, employment, success in business, recovery from illness, &c. These may be grouped together as class A. Then we have prayers for help in moral and intellectual difficulties and for spiritual growth--for the overcoming of temptations, for strength, for insight, for enlightenment. These may be grouped as Class B. Lastly, there are the prayers that ask for nothing, that consist in meditation on and adoration of the divine Perfection, in intense aspiration for union with God--the ecstasy of the mystic, the meditation of the sage, the soaring rapture of the saint. This is the true "communion between the Divine and the human," when the man pours himself out in love and veneration for THAT which is inherently attractive, that compels the love of the heart. These we will call Class C. In the invisible worlds there exist many kinds of Intelligences, which come into relationship with man, a veritable Jacob's ladder, on which the Angels of God ascend and descend, and above which stands the Lord Himself.[296] Some of these Intelligences are mighty spiritual Powers, others are exceedingly limited beings, inferior in consciousness to man. This occult side of Nature--of which more will presently be said[297]--is a fact, recognised by all religions. All the world is filled with living things, invisible to fleshly eyes. The invisible worlds interpenetrate the visible, and crowds of intelligent beings throng round us on every side. Some of these are accessible to human requests, and others are amenable to the human will. Christianity recognises the existence of the higher classes of Intelligences under the general name of Angels, and teaches that they are "ministering spirits, sent forth to minister;"[298] but what is their ministry, what the nature of their work, what their relationship to human beings, all that was part of the instruction given in the Lesser Mysteries, as the actual communication with them was enjoyed in the Greater, but in modern days these truths have sunk into the background, except the little that is taught in the Greek and Roman communions. For the Protestant, "the ministry of angels" is little more than a phrase. In addition to all these, man is himself a constant creator of invisible beings, for the vibrations of his thoughts and desires create forms of subtle matter the only life of which is the thought or the desire which ensouls them; he thus creates an army of invisible servants, who range through the invisible worlds seeking to do his will. Yet, again, there are in these worlds human helpers, who work there in their subtle bodies while their