A writer has well given to mediums the following inspiring message concerning the nature, purpose and aims of their work: "The modes of spirit manifestation are many, the phases wonderfully varied, but, like a golden cord running through them all, there is a distinct purpose of bringing to those on earth the glad tidings and proof positive of continued conscious personal experience in the life after death. The process of psychic development is usually slow, and the medium will be likely to grow disheartened; but by looking back over the ground already traversed, and by comparing the faint efforts made at the commencement with the later and fuller indications of spirit power, he should feel encouraged, and proceed with renewed vigor." Gradual Development. The best authorities constantly impress upon young mediums the fact that they should develop their mediumistic powers to a considerable degree before they venture to give public seances or exhibitions of their power. As Dr. Dean Clarke well says: "Novices in mediumship have no business to assume obligations they are not fully qualified to fulfil. Let them take the counsel metaphorically given by Jesus, to 'tarry in Jerusalem till their beards are grown.'" They should by all means wait until the spirits are strong enough to control and guard them from the meddlesome interferences of other persons, both those in the flesh and those out of it. Many spirits will overwork the medium, and the latter not knowing enough to protect himself will often suffer by reason thereof. On the other hand, young mediums often yield to the importunities of friends and other sitters, and will try to oblige and satisfy them, even often at the expense of their own powers and forces. Public Seances.