A Forgotten Stream in German Spiritual Life

That is what is significant about a personality like Planck: he attains an inner state in which he does not reflect upon but rather experiences the truth of a thought; he unfolds a special power in his own soul by which to experience when not to think a particular thought because, through its own nature, it kills itself. To grasp the existence of a reality that bears within itself its own life and its own death, this belongs to the kind of soul attitude that does not depend upon the sense world to tell it: this is or this is not.