The psychiatrist Carl Jung understood this too, which is why he described the integrity of the person as depending on one’s willingness to seek out, and incorporate into one’s identity, not only the ‘light’ parts of one’s self, but also the ‘darkness,’ which he called the ‘shadow,’ the tendencies of which, in most people, seem to be suppressed by the conscious mind, which feels such an obligation to the civilizing effects of society that any of its darker, more instinctive, less rational impulses are discouraged from manifesting, and thus are relegated to the subconscious, where, if they have no outlet, and no means of expression, they can develop into neuroses, which are not so uncommon as one might think, though even if they don’t do this (develop into neuroses) the failure to integrate them can still prevent the expansion of personality that individuals must undergo if they want to actualize.