All of Edison's inventions, those of every inventor, have been wrought out on the same principle that gave us the sewing machine and the telephone. They all started in simple ideas, in dream visions which were nursed and worked into actualities.

According to Darwin, the desire to ascend into the heavens preceded the appearance and development of the eagle's wings. It is said our different organs and functions have been developed from a sense of need of them, just as the wings of the eagle developed from a desire to fly.

The brain cells grow in response to desire. Where there is no desire there is no growth. The brain develops most in the direction of the leading ambition, where the mental activities are the most pronounced. The desire for a musical career, for instance, develops the musical brain cells. Business ambition develops that part of the brain which has to do with business, the cells which are brought into action in executive management, in administering affairs, in money making. Wherever we make our demand upon the brain by desire that part responds in growth.

For years a poor country boy builds air castles of his future. He visualizes the great mercantile establishment over which he is to preside. The ridicule of his family and of young companions cannot daunt him or blur the bright vision he sees away in the distance. He continues to nurse his vision, and behold, out of the unknown, unexpected resources come, and soon he finds himself an office boy in a great mercantile house in the city of his dreams. He watches everything with an eagle eye; he absorbs information and ideas; he is alert, active, energetic, resourceful, and in a few months he is promoted, and then again promoted. He attracts the attention of the head of the establishment, who calls him into his private office, tells him that he has had his eye on him for many months and that he believes he is the youth he has been looking for to manage the business. He gives him a little stock; the business prospers still further under his management, and in a few years the new manager is made a full partner in the house which he entered as an office boy. This is the flowering out of his dream, the objectifying of his vision, the matching with reality his youthful longings. His brain has been continually developing along the line of his vision, drawing to him the material to make it real.

A poor girl, the daughter of humble people in Maine who thought that to become a public singer was an unforgivable sin, could not in the beginning see any possible way to realize the dreams she held in secret, but she kept visualizing her dream, nursing her desire and doing the only thing for its realization her parents would allow,—singing in a little church choir. Gradually the way opened, and one step led to another until the little Maine girl became the famous Madame Nordica, one of the world's greatest singers.

No matter if you are a poor girl away back in the country, and see no possible way of leaving your poor old father and mother in order to prepare for your career, don't let go of your desire. Whether it be music, art, literature, business or a profession, hold to it. No matter how dark the outlook, keep on visualizing your desire and light and opportunity will come to enable you to make it a reality. Whatever the Creator has fitted you to do He will give you a chance to do, if you cling to your vision and struggle as best you can for its attainment.

Think of the Lillian Nordicas, the Lucy Stones, the Louisa Alcotts, the Mary Lyons, the Dr. Anna Howard Shaws, the thousands of women who were hedged in just as you are, by poverty or forbidding circumstances of some sort, yet succeeded in spite of everything in doing what they desired to do, in being what they longed to be. Take heart and believe that God has given you also "all implements divine to shape the way" to your soul's desire.

If you are a boy on a farm and feel that you are a born engineer, yet see no possible way to get a technical education, don't lose heart or hope. Get what books you can on your specialty. Cling to your vision. Push out in every direction that is possible to you. It may take years, but if you are true to yourself your concentration on your desire, your pushing toward it, will open a door into the light, and before you know it you will be on the road to your goal.

The Washingtons, the Lincolns, the Faradays, the Edisons, the men who have done most for their country and for humanity have had to struggle as hard as you are struggling to attain their heart's desire. The opportunities for boys and girls to bring out whatever the Creator has implanted in them are ten to one to-day to what they were one hundred, or fifty, or even twenty-five years ago. The great danger in our time is not lack of chance or opportunity but of losing our vision, of letting our ambition die.

Most of us instead of treating our desires seriously trifle with them as though they were only to be played with, as though they never could be realities. We do not believe in their divinity. We regard our heart longings, our soul yearnings as fanciful vagaries, romances of the imagination. Yet we know that every invention, every discovery or achievement that has blessed the world began in a desire, in a longing to produce or to do a certain thing, and that the persistent longing was accompanied by a struggle to make the mental picture a reality.