Gabirol is also the author of an ethical work which he composed in 1045. Though of little importance philosophically, or perhaps because of this, the "Tikkun Middot ha-Nefesh" (Improvement of the Qualities of the Soul) fared much better than its more important companion, the "Mekor Hayim." Not only did it have the privilege of a Hebrew translation at the hands of the father of translators, Judah ibn Tibbon, but the original Arabic itself is still extant and was recently published with an English translation by Stephen S. Wise (1901).[103] The Hebrew translation also had the good fortune of being reprinted several times. This is due to the fact that the "Tikkun Middot ha-Nefesh" is a popular work, dealing with morals, and does not go into metaphysical questions. It is full of Biblical citations, which stamps it as Jewish; and there are also in it quotations from Arabic writers serving to illustrate the argument and lending variety and interest to the style. The larger question of the aim of human life is touched on in the "Fons Vitæ." We are told there that the ultimate aim of man's existence is that the soul should unite with the upper world to which it belongs.[104] The particular human soul is according to Gabirol a part, though not in a physical sense, of the cosmic soul, which is one of the universal spiritual substances (see above, p. 66). Hence its own real existence is spiritual and eternal, and independent of the body. Its entrance into the body obscures its spiritual vision, though it does not lose all touch with the higher world from which it came. The senses and the data of sense perception are not an end in themselves; they are only a means for the soul through them to recall the higher knowledge which was its own in its spiritual existence, and thereby win its return to the intelligible world. Man's duty therefore in this world is to strive to attain this higher life for his soul. This is brought about by means of _knowledge_ and _practice_. This knowledge has to do with knowing all things as they really are, and particularly the intelligible substances and the Prime Essence. Practice signifies to keep away as far as possible from things of sense, which are foreign to the soul and might injure it. What more particularly the things are which are beneficial to the soul, and what are injurious, we learn from Gabirol's ethical treatise. Man's soul has a higher and a lower nature. The higher power is the reason or rational soul, the lower is the animal or vegetative soul; and man's business is to see that the reason rules over the lower nature.