The painter who is familiar with the nature of the sinews, muscles, and tendons, will know very well, in giving movement to a limb, how many and which sinews cause it; and which muscle, by swelling, causes the contraction of that sinew; and which sinews, expanded into the thinnest cartilage, surround and support the said muscle.
There is a philosophy that says that if something is unobservable -- unobservable in principle -- it is not part of science. If there is no way to falsify or confirm a hypothesis, it belongs to the realm of metaphysical speculation, together with astrology and spiritualism. By that standard, most of the universe has no scientific reality -- it's just a figment of our imaginations.
The strength that we want is not a brute, unregulated strength; the beauty that we want is no mere surface beauty; but we want a beauty on the surface of life that is from the central force of principle within, as the beauty on the cheek of health is from the central force at the heart.
No longer mourn for me when I am deadthan you shall hear the surly sullen bell give warning to the world that I am fled from this vile world with vilest worms to dwell: nay, if you read this line, remember not the hand that writ it, for I love you so, that I in your sweet thoughts would be forgot,if thinking on me then should make you woe. O! if, I say, you look upon this verse when I perhaps compounded am with clay, do not so much as my poor name rehearse; but let your love even with my life decay; lest the wise world should look into your moan, and mock you with me after I am gone.