When acknowledged and defined Faith departs, it is clear that of the remaining two rivals, Opinion has no ground against Science. That which can be demonstrated holds all the field. Indeed, it is the mark of modern insufficiency that it can conceive of no other form of certitude save certitude through demonstration, and therefore does not, as a rule, appreciate even its own unproved first principles. Well, this function of the isolated soul, inquiry and the necessity for demonstration for individual conviction through measurement and physical fixed knowledge, has occupied, as we all know, the three modern centuries. We all are equally familiar with its prodigious results. Not one of them has, as yet, added to human happiness: not one but has been increasingly misused to the misery of man. There is in the tragedy something comic also, which is the perpetual puzzlement of these the very authors of discovery, to find that, somehow or other, discovery alone does not create joy, and that, somehow or other, a great knowledge can be used ill, as anything else can be used ill. Also in their bewilderment, many turn to a yet further extension of physical science as promising, in some illogical way, relief. A progression in physical science and in the use of instruments is so natural to man (so long as civic order is preserved) that it would, indeed, have taken place, not so rapidly, but as surely, had the unity of Europe been preserved. But the destruction of that unity totally accelerated the pace and as totally threw the movement off its rails. The Renaissance, a noble and vividly European thing, was much older than the Reformation, which was its perversion and corruption. The doors upon modern knowledge had been opened before the soul, which was to enter them, had been cut off from its fellows. We owe the miscarriage of all our great endeavor in this field, not to that spring of endeavor, but to its deflection. It is a blasphemy to deny the value of advancing knowledge, and at once a cowardice and a folly to fear it for its supposed consequences. Its consequences are only evil through an evil use, that is, through an evil philosophy.