What in the current half-year's term I was regarding rather from a theoretical standpoint, I intended in the next half-year to study practically as a factor of actual life: hence I passed to organic chemistry and geology.[75] Those laws which I was able to observe in Nature I desired to trace also in the life and proceedings of man, wherefore I added to my previous studies history, politics, and political economy. These practical departments of knowledge brought vividly home to me the great truth that the most valuable wealth a man can possess lies in a cultivated mind, and in its suitable exercise upon matters growing out of its own natural conditions. I saw further that wealth arose quite as much from vigour of production as from saving by economical use; and that those productions were the most valuable of all, which were the outcome and representation of lofty ideas or remarkable thoughts; and finally, that politics itself was in its essence but a means of uplifting man from the necessities of Nature and of life to the freedom of the spirit and the will. While I received much benefit from the lectures on natural history at the university, I could not fall in with the views held there as to fixed forms--crystallography, mineralogy, and natural philosophy. From what I had heard of the natural history lectures of Professor Weiss in Berlin, I felt sure that I could acquire a correct view of both these subjects from him. And also since my means would not allow me to stay even so long as one entire session more at Goettingen, whilst on the other hand I might hope at Berlin to earn enough by teaching to maintain a longer university career there, I came to the conclusion to go to Berlin at the beginning of the next winter session to study mineralogy, geology, and crystallography under Weiss, as well as to do some work at physics and physical laws. After a stay of a few weeks with my brother at Osterode, I went to Berlin in October 1812. The lectures for which I had so longed really came up to the needs of my mind and soul, and awakened in me, more fervent than ever, the certainty of the demonstrable inner connection of the whole cosmical development of the universe. I saw also the possibility of man's becoming conscious of this absolute unity of the universe, as well as of the diversity of things and appearances which is perpetually unfolding itself within that unity; and then, when I had made clear to myself, and brought fully home to my consciousness, the view that the infinitely varied phenomena in man's life, work, thought, feeling, and position, were all summed up in the unity of his personal existence, I felt myself able to turn my thoughts once more to educational problems.