If we could see the molecular and chemical changes and transformations that are going on around us, another world of instability would be revealed to us. Here we should see real miracles. We should see the odorless gases unite to form water. We should see the building of crystals, catalysis, and the movements of unstable compounds.
Think of what Nature does with varying degrees of temperature—solids, fluids, gases. From the bottom to the top of the universe means simply more or less heat. It seems like a misuse of words to say that iron freezes at a high temperature, that a bar of red-hot or white-hot iron is frozen. Water freezes at a high temperature, the air freezes at a vastly lower. Carbon dioxide becomes a solid at a very low temperature. Hydrogen becomes a liquid at 252° below zero centigrade, and a solid at 264°. The gas fluorine becomes a liquid at 210° below zero centigrade.
In a world of absolute zero everything would be as solid as the rocks, all life, all chemical reactions would cease. All forms of water are the result of more or less heat. The circuit of the waters from the earth to the clouds and back again, which keeps all the machinery of life a-going, is the work of varying degrees of temperature. The Gulf Stream, which plays such a part in the climate of Europe, is the result of the heat in the Gulf of Mexico. The glacial periods which have so modified the surface of the earth in the past were the result of temperature changes.
How habitually we speak of beauty as a positive thing, just as we do of truth! whereas what we call beauty is only an emotional experience of our own minds, just as light and heat are sensations of our bodies. There is no light where there is no eye, and no sound where there is no ear. One is a vibration in the ether, and the other a vibration in the air. The vibrations are positive. We do not all see beauty in the same things. One man is unmoved where another is thrilled. We say the world is full of beauty, when we mean that it is full of objects that excite this emotion in our minds.
We speak of truth as if it, too, were a positive thing, and as if there were a fixed quantity of it in the world, as there is of gold or silver, or diamonds. Truth, again, is an intellectual emotion of the human mind. One man's truth is another man's falsehood—moral and æsthetic truth, I mean. Objective truth (mathematics and science) must be the same to all men.
A certain mode of motion in the molecules of matter gives us the sensation of heat, but heat is not a thing, an entity in itself, any more than cold is. Yet to our senses one seems just as positive as the other.
New truth means a new man. There are as many kinds of truth as there are human experiences and temperaments.