We acknowledge the truth of the following considerations: There exists no colour, nor sound, nor odour in the objective world, but there are the vibrations of ether, or the undulations of the air, or the stimuli of the sensory nerves of smell. Colour is nothing but the translation of the stimuli into sensation by the optical nerves, so also sounds by the auditory, and odours by the smelling. Therefore nothing exists objectively exactly as it is perceived by the senses, but all are subjective. Take electricity, for example, it appears as light when perceived through the eye; it appears as sound when perceived through the ear; it appears as taste when perceived through the tongue; but electricity in reality is not light, nor sound, nor taste. Similarly, the mountain is not high nor low; the river is not deep nor shallow; the house is not large nor small; the day is not long nor short; but they seem so through comparison. It is not objective reality that displays the phenomenal universe before us, but it is our mind that plays an important part. Suppose that we have but one sense organ, the eye, then the whole universe should consist of colours and of colours only. If we suppose we were endowed with the sixth sense, which entirely contradicts our five senses, then the whole world would be otherwise. Besides, it is our reason that finds the law of cause and effect in the objective world, that discovered the law of uniformity in Nature, and that discloses scientific laws in the universe so as to form a cosmos. Some scholars maintain that we cannot think of non-existence of space, even if we can leave out all objects in it; nor can we doubt the existence of time, for the existence of mind itself presupposes time. Their very argument, however, proves the subjectivity of time and space, because, if they were objective, we should be able to think them non-existent, as we do with other external objects. Even space and time, therefore are no more than subjective. 10. Idealism is a Potent Medicine for Self-created Mental Disease.