We maintain that philosophy so far has acquired something positive, has left us a legacy, and that this consists in a clear revelation of the method of using our intellect in order to produce excellent pictures of nature and its phenomena. For the purpose of making the reader familiar with this method, with this legacy of philosophy, we must enter more closely into the essence of the instrument which lifts all the treasures of science. We are especially interested in the question, whether it is a finite or infinite and universal instrument with which we go fishing for truth. It is the custom to belittle the faculties of the human understanding, in order to keep it under the supremacy of the divine metaphysical augurs. It is quite easy to see, therefore, that the question of the essence of our powers of understanding is intimately related to, or even identical with, the question of how we may be permitted to use them, whether they should be used only for the investigation of the limited, finite, or also for the study of the eternal, infinite, and immeasurable. We object here to the tendency of belittling the human mind. About a hundred years ago, the philosopher Kant found it appropriate to draw the sword against those who played fast and loose with the human mind, against the socalled metaphysicians. They had made a miraculous thing of the instrument of thought, a matter for effusions. In order to be able clearly to state the outcome of philosophy, we must acquaint the reader with the fact that this instrument of thought, in its way, is one of the best and most magnificent things in existence, but that, at the same time, it is bound to its general kind or genus. The human understanding perceives quite perfectly, but we must not have an exaggerated idea of its perfection, any more than we would of a perfect eye or ear, that, be they ever so perfect, cannot see the grass grow or hear the fleas cough. God is a spirit, says the bible, and God is infinite. If he is a spirit, an intellect, such as man, then it would be fair to assume that man's intellect is also infinite, or even is the divine spirit itself which has taken up its abode in the human brains. People cudgeled their brains with such confused conceptions, so long as the object of modern philosophy, the intellect, was a mystery. Now it is recognized as a finite, natural phenomenon, an energy or a force which is not the infinite, though it is, like all other matter and force, a part of the infinite, eternal, immeasurable.