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.

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.

The quest of the absolute leads into the four-dimensional world.

Events do not happen; they are just there, and we come across them.

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

[When thinking about the new relativity and quantum theories] I have felt a homesickness for the paths of physical science where there are ore or less discernible handrails to keep us from the worst morasses of foolishness.

Schrödinger's wave-mechanics is not a physical theory, but a dodge - and a very good dodge too.