The physical world is entirely abstract and without actuality apart from its linkage to consciousness.
It is one thing for the human mind to extract from the phenomena of nature the laws which it has itself put into them; it may be a far harder thing to extract laws over which it has no control.
We have found that where science has progressed the farthest, the mind has but regained from nature that which the mind put into nature.
Physics has in the main contented itself with studying the abridged edition of the book of nature.
Shuffling is the only thing which Nature cannot undo.
Consciousness is not sharply defined, but fades into sub-consciousness; and beyond that we must postulate something indefinite but yet continuous with our mental nature. This I take it be the world-stuff.
I think that science would never have achieved much progress if it had always imagined unknown obstacles hidden round every corner. At least we may peer gingerly round the corner, and perhaps we shall find there is nothing very formidable after all.
The whole subject-matter of exact science consists of pointer readings and similar indications.
Oh leave the Wise our measures to collate. One thing at least is certain, light has weight. One thing is certain and the rest debate. Light rays, when near the Sun, do not go straight.
Every body continues in its state of rest or uniform motion in a straight line, except insofar as it doesn't.
It is even possible that laws which have not their origin in the mind may be irrational, and we can never succeed in formulating them.
We do not argue with the critic who urges that the stars are not hot enough for this process; we tell him to go and find a hotter place.
It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.
It is sound judgment to hope that in the not too distant future we shall be competent to understand so simple a thing as a star.
Proof is an idol before whom the pure mathematician tortures himself.