But it is necessary to insist more strongly than usual that what I am putting before you is a model-the Bohr model atom-because later I shall take you to a profounder level of representation in which the electron instead of being confined to a particular locality is distributed in a sort of probability haze all over the atom.

Shuffling is the only thing which Nature cannot undo.

What is possible in the Cavendish Laboratory may not be too difficult in the sun.

In any attempt to bridge the domains of experience belonging to the spiritual and physical sides of nature, time occupies the key position.

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

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

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.