For the human mind cannot contain any emotion, no matter how weak or how fleeting, without change. And the point at which that change ceases to be constructive and becomes, instead, destructive—that is the ultimate point beyond which no human mind can go without forcing a change—any change—in itself.
Spencer Candron knew that. To overuse the psionic powers of the human mind is as dangerous as overusing morphine or alcohol. There are limits to mental powers, even as there are limits to physical powers.
Psychokinesis is defined as the ability of a human mind to move, no matter how slightly, a physical object by means of psionic application alone. In theory, then, one could move planets, stars, even whole galaxies by thought alone. But, in physical terms, the limit is easily seen. Physically, it would be theoretically possible to destroy the sun if one had enough atomic energy available, but that would require the energy of another sun—or more. And, at that point, the Law of Diminishing Returns comes into operation. If you don’t want a bomb to explode, but the only way to destroy that bomb is by blowing it up with another bomb of equal power, where is the gain?
And if the total mental power required to move a planet is greater than any single human mind can endure—or even greater than the total mental endurance of a thousand planetsfull of minds, is there any gain?
There is not, and can never be, a system without limits, and the human mind is a system which obeys that law.
None the less, Spencer Candron kept his mind on flight, on repulsion, on movement, as long as he could. He was perfectly willing to destroy his own mind for a purpose, but he had no intention of destroying it uselessly. He didn’t know how long he kept moving eastward; he had no way of knowing how much distance he had covered nor how long it had taken him. But, somewhere out over the smoothly undulating surface of the Pacific, he realized that he was approaching his limit. And, a few seconds later, he detected the presence of men beneath the sea.
He knew they were due to rise an hour before dawn, but he had no idea how long that would be. He had lost all track of time. He had been keeping his mind on controlling his altitude and motion, and, at the same time, been careful to see whether Dr. Ch’ien came out of his unconscious state. Twice more he had had to strike the physicist to keep him out cold, and he didn’t want to do it again.
So, when he sensed the presence of the American submarine beneath the waves, he sank gratefully into the water, changing the erosive power of the emotion that had carried him so far, and relaxing into the simple physical routine of keeping both himself and Ch’ien afloat.
By the time the submarine surfaced a dozen yards away, Spencer Candron was both physically and mentally exhausted. He yelled at the top of his lungs, and then held on to consciousness just long enough to be rescued.