(1) The testimony of consciousness. This is clear and explicit. We are directly conscious of free choice. And there can be no evidence more immediate and authoritative than that of consciousness. It is the form of evidence in which all psychical facts, activities, powers, and laws, are made known and stand certified in our knowledge. It is the certifying element for both the form and reality of all our knowing. It is that in which we "know that we know," and without which there can be no knowledge. It is, therefore, the foundation certitude. Our systems of science, our conclusions in philosophy, our intuitions into first truths and laws, and all the confidence with which we accept truth in all these great realms of mental life, rest back on the observations, reasonings and conclusions for whose reality and order consciousness is our most fundamental voucher. To its tests and verifications all the processes of knowing must submit. No truth is even visible except in the light in which consciousness holds all our acts and forms of intelligence. No form of our knowing can be surer than this. To discredit it is to discredit that without whose help not a step in knowledge can be taken. Upon this fundamental and unsurpassable evidence rests the great fact of free-will. No person, in the simple light of his unperverted and unperplexed consciousness, doubts his free-will. He finds himself in exercise and use of it every day and every hour. He knows himself to be perpetually making decisions within his own liberty, if he knows anything. The witness to it is direct, and he holds himself, and others hold him, responsible for his choices and the deeds he does in carrying them out. He deliberately and consciously elects his way through clearly seen open alternative possibilities. If he is to believe that in reality he does not do so, he must believe that his consciousness is a perpetual fraud upon him. But thus the authority for the reality of all his psychical capacities and acts is overthrown, and he does not "know that he knows" in any of his knowing.