This book is a collection of the finest mystical writings of the great physicists of the 20th Century. They are Max Planck, Albert Einstein, Niels Bohr, Werner Heisenberg, Erwin Schrödinger, Wolfgang Pauli, James Jeans, Arthur Eddington, Eugene Wigner, David Bohm, and Freeman Dyson. The essays are written in nontechnical language and will be of absorbing interest to a wide range of readers.