A writer on this subject well says: "Just as a drum or tamborine is incapable of being made to emit a tithe of what can be produced by means of a piano or a violin, in the way of music, so the differences in quality and conditions of the physical organisms, and in the degree of nervous and psychical sensibility of those who desire mediumship, render it improbable that any but a small proportion will develop such extreme susceptibility to spirit influence as will repay them for the time and self-sacrifice involved in the cultivation of their powers. Further, it should be borne in mind that while wise spirits are ever ready to respond to the call of the earnest aspirant for spiritual truth, as wise spirits they are not likely to devote themselves to the preparation of an instrument that would be inefficient for their purpose. The nervous system of the medium, whatever his phase may be, has to be trained to respond to the will and the psychic force of the controlling spirit, just as much as the muscles of the musician or artist, and 'practice makes perfect' in the one case as well in the other. Since mediumship is a strictly natural qualification, depending upon organic fitness and susceptibility, it is not a supernatural power or a special 'gift,' neither does it insure the moral purity nor the intellectual ability of the medium, any more than musical or artistic capabilities are evidences of the special intelligence or the high moral tones of their possessors." Mediumship and Genius. The spirits controlling the hand of a celebrated writing medium, once delivered through him the following message regarding the nature and development of mediumistic powers: "Mediumship is a development of that which is, in another sort, genius. Genius, the opened and attentive ear to spirit guidance and inspiration, shades away into mediumship, the facile instrument of spirit manifestation. In proportion as the medium becomes open to influence, directly exercised, is he valuable as a means whereby direct messages are conveyed. And in proportion as the individual spirit is lost and merged in the great ocean of spirit, is the result most direct and serviceable. It is when the passive spirit is content to allow us to use the corporeal instrument, as it does when itself operates, that we gain satisfactory results. That can only be when a condition of perfect passivity, as far removed from scepticism as from credulity, has been secured. This opening of the spiritual being to spiritual influences is what you call mediumship. The true and valuable gifts are purely spiritual and must be used for spiritual purposes; not for gain, or for satisfying curiosity, or for base or unworthy ends." Spontaneous Mediumship.