Do not forget that all that we know we have "worked for." There is nothing that comes to the idler, or shirker. What we know is merely the result of "stored-up accumulations of previous experience," as Lewes has so well said. So it will be seen that the Yogi idea that one should develop all parts of the Mind is strictly correct, if one will take the trouble to examine into the matter. A man sees and knows but very little of what is going on about him. His limitations are great. His powers of vision report only a few vibrations of light, while below and above the scale lie an infinity of vibrations unknown to him. The same is true of the powers of hearing, for only a comparatively small portion of the sound-waves reach the Mind of Man--even some of the animals hear more than he does. If a man had only one sense he would obtain but a one-sense idea of the outside world. If another sense is added his knowledge is doubled. And so on. The best proof of the relation between increased sense perception and development is had in the study of the evolution of animal forms. In the early stages of life the organism has only the sense of feeling--and very dim at that--and a faint sense of taste. Then developed smell, hearing and sight, each marking a distinct advance in the scale of life, for a new world has been opened out to the advancing forms of life. And, when man develops new senses--and this is before the race--he will be a much wiser and greater being. Carpenter, many years ago, voiced a thought that will be familiar to those who are acquainted with the Yogi teachings regarding the unfoldment of new senses. He said: "It does not seem at all improbable that there are properties of matter of which none of our senses can take immediate cognizance, and which other beings might be formed to perceive in the same manner as we are sensible to light, sound, etc." And Isaac Taylor said: "It may be that within the field observed by the visible and ponderable universe there is existing and moving another element fraught with another species of life--corporeal, indeed, and various in its orders, but not open to cognizance of those who are confined to the conditions of animal organization. Is it to be thought that the eye of man is the measure of the Creator's power?--and that He created nothing but that which he has exposed to our present senses? The contrary seems much more than barely possible; ought we not to think it almost certain?" Another writer. Prof. Masson, has said: "If a new sense or two were added to the present normal number, in man, that which is now the phenomenal world for all of us might, for all that we know, burst into something amazingly different and wider, in consequence of the additional revelations of these new senses."