Let me sum up, in a brief way, the effect of colour on the mind, and consequently on the body. Red tends to excite to activity, so that people who are sensitive and excitable should avoid the use of this colour. Orange, in a lesser way, produces similar effects. These two colours more nearly represent the elemental side of life. Yellow, to a degree, would excite to mental activity, but that activity is not expressed through the physical, to the same degree as red or orange. Green, in its varying shades, is really the most soothing and restful of all colours. The very lightest shades of green that come under the head of luminous colours are not so restful as the darker shades; but the luminous shades of green may often be used to quicken the mentality of sensitive-minded people who have become mentally morbid or sluggish. Some shades of blue are very restful. They seem to call out something of the inner rest and peace of life, but the darker shades tend toward making one mentally and physically torpid. The darker shades of blue might be of great help to one who was hysterical or highly excited. Many physicians advise that the rooms of their patients be kept darkened. Others go to the other extreme, and are in favor of a great deal of light. It seems to me that good judgment must be exercised in the use of light. In diseases accompanied by fever or mental excitement, the light should be of a soft or subdued nature, while in many kinds of chronic diseases, where mind and body are both sluggish, and vitality is low, great light is needed to stir to greater activity of mind and body. Too much light of a glaring nature is not good for even a healthy person. It is apt to induce mental restlessness and physical languor. I have carefully noted the effects of light and heat in Italy and Florida. The Italian people during the summer do comparatively little work in the middle of the day; many of them resting for several hours before returning to their business or work. In this way they seem to be able to accomplish more than the people who continue to work throughout the day. I have known very wide-awake and energetic people who have gone from New England to Florida, and for a time they have been able to keep up their mental and physical activities for the same number of hours as they had formerly done in the North. But after a time they grew mentally sluggish and physically inactive. Possibly, if they had used the same methods that the Italians use, this condition need never have arisen. The fact of the matter is that temperance in everything is necessary for the best mental and physical poise. The Italian, when he goes home at noontime, goes there for repose, for rest, so that later he may take up his work and carry it on in a vigorous way. The curtains and blinds are all closed on the sunny side of his house, and the windows are open on the shady side. In this way, even when the weather is very hot, he does not feel it to the same degree that people do who have not established his habits. Shade, especially in the summer-time, is helpful to mental contemplation, to rest and repose of mind and body. But too often people who have been sick for a long time feel that the room should be darkened; this, instead of making for rest of mind and body, will bring about mental depression, and it often has the effect of inducing melancholia.
Every disease of mind and body has its own particular psychology, and unless the physician is fully alive to this fact, he will make many mistakes in his efforts to effect cures. Let it once be fully understood that the causes of disease are of a psychological nature, and that it will only be through a real psychology which is able to perceive the nature of these causes and to know how to meet them in a thoroughly scientific, psychological way, that the real science of healing will be advanced. The study into the physical pathology and the morbid anatomy of disease has done far more to retard true healing than perhaps almost any or all other factors introduced into medicine. Too much time and attention have been given to the morbid and unreal side of life. What the world needs to-day is a far deeper insight and a more comprehensive knowledge as to how life can best be lived so that diseases may be avoided. We need to know first of all how to live, and the physicians of the future will pay far less attention to drug medication, and other kindred things that they deem so necessary at the present time, and will devote their time to more natural ways of treating their patients. The treatment of the future, instead of filling the mind with fear, as too often it does at the present, will not only rob the mind of fear, but will give pleasure as well to the patient. For music and colour will of a certainty supersede the present poisonous drug system. While there may be other things used in connection with them, yet they will form the fundamentals from which a new structure of health and healing shall rise.
Each step in the unfolding of colour to the human vision means an upward step in the development of humanity. There is a law of correspondence, wherein outer changes symbolise changes in man's inner life. Nature is not to be viewed as something separate and apart from man's life. It is the same Life that lives and moves in nature, that lives and moves and has its being in man. Nature symbolises what man has been and what man is, and in man's fuller development, nature will still continue to keep the record. With the higher development, there will come a greater appreciation of everything that is beautiful, and this appreciation will have the effect of causing man to vibrate to a higher octave of being. The vibration thus set up in his own life will bring him in touch with nature's higher vibrations. Not only will he see with new eyes, but hear with new ears; for seeing and hearing are both indications of a progressive state of being. The man who closes his eyes to the beauties of nature will eventually be unable to perceive such beauties. The man who closes his ears to the melody, rhythm, and harmony of life will gradually lose what hearing he has. For "unto every one that hath, shall be given; and from him that hath not, even that he hath shall be taken away from him." "He that hath eyes, let him see; and he that hath ears, let him hear." Through such seeing and hearing, greater desires and larger ideals will enter into life, for everything that is true in man's consciousness is there in order that it shall be realised. All inner truths are capable of outer expression. The beauties of colour and music have for us a thousand times more value than either eye hath seen or ear hath heard. It will be through fostering the love of colour, and seeing all there is to see in it that the new octave of colour will come. First of all, it will be seen by the mind's eye; later it will take on an outward manifestation. The rainbow is most assuredly a symbol of hope, and the double rainbow gives us the assurance that we may hope for a new octave of colour, and that our hope shall be fully realised.