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.

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

Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers.

You cannot disturb the tiniest petal of a flower without the troubling of a distant star.

The physical world is entirely abstract and without actuality apart from its linkage to consciousness.

Shuffling is the only thing which Nature cannot undo.

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