All we know at present of locomotion is the locomotion of one piece of matter with reference to other pieces. That can be freely granted, and the whole edifice of physics is consistent with the idea that locomotion through the ether is impossible to measure. But the impossibility has never been proved, and some day an exceptional phenomenon may be found.

It must be admitted that among a certain number of advanced mathematical physicists whose work has lain mainly in the twentieth century, the ether is regarded with suspicion, or even with contempt. And some of the opponents go so far as to as to say that the nineteenth century idea of the ether has failed to establish itself, and that in consequence the whole idea of the ether is under a cloud, and that it is only upheld by a few antiquated supporters, who, though are willing to admit many modifications in the original nineteenth century notions of an ether, feel the need of a medium capable of performing the functions attributed to it.

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Every great revelation is likely to have been foreshadowed in more or less imperfect forms, so as to prepare our minds and make ready the way for complete perception hereafter. It is probable that the human race is quite incompetent to receive a really great idea the first time it is offered.

I am as convinced of continued existence, on the other side of death, as I am of existence here. It may said, you cannot be sure as you are of sensory experience. I say I can. A physicist is never limited to direct sensory impressions, he has to deal with a multitude of conceptions and things for which he has no physical organ ....

The things to be investigated are either true or false. If false, pertinacious inquiry will reveal their falsity. If true, they are profoundly important. For there are no half-truths in Nature; every smallest departure has portentous consequences; our eyes must open slowly, or we should be overwhelmed.

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Death is not extinction. Neither the soul nor the body is extinguished or put out of existence. The body weighs just as much as before, the only properties it loses at the moment of death are potential properties. So also all we can assert concerning the vital principle is that it no longer animates that material organism: we cannot safely make further assertion regarding it, or maintain its activity or inactivity without further information.

I have made no secret of my conviction, not merely that personality persists, but that its continued existence is more entwined with the life of every day than has been generally imagined; that there is no real breach of continuity between the dead and the living; and that methods of intercommunion across what has been deemed a gulf can be set going in response to the urgent demand of affection,—that in fact as Diotima told Socrates (Symposium, 202 and 203),

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