Max Planck Quote

Physic, it may be urged, is solely concerned with the objects and events of inanimate nature, while a general philosophy, if it is to be at all satisfactory, must embrace the whole of physical and intellectual life and must deal with questions of the soul, including the highest problems of ethics.

Translated by W.H. Johnston, The Philosophy of Physics, Chapter I (p. 9), W.W. Norton & Co. 1936