For the truth of the conclusions of physical science, observation is the supreme Court of Appeal.

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. 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.

There is no space without aether, and no aether which does not occupy space.

Who will observe the observers?

Whatever else there may be in our nature, responsibility toward truth is one of its attributes.

There is only one law of Nature-the second law of thermodynamics-which recognises a distinction between past and future more profound than the difference of plus and minus. It stands aloof from all the rest. ... It opens up a new province of knowledge, namely, the study of organisation; and it is in connection with organisation that a direction of time-flow and a distinction between doing and undoing appears for the first time.

In the most modern theories of physics probability seems to have replaced aether as "the nominative of the verb 'to undulate'."