Excerpt from "Psychology and Alchemy" by Carl G. Jung

"[This example] shows that the difficult operation of thinking in paradoxes--a feat possible only to the superior intellect--has succeeded. [T]his results in a serious conflict for the conscious mind because it is not always either willing or able to put forth the extraordinary intellectual and moral effort needed to take a paradox seriously. Nothing is so jealous as a truth. [T]here is no light without shadow and no psychic wholeness without imperfection. To round itself out, life calls not for perfection but for completeness; and for this the 'thorn in the flesh' is needed, the suffering of defects without which there is no progress and no ascent." (Emphasis added.)

Excerpt from "The Transcendent Function" by Carl G. Jung

"The present day shows with appalling clarity how little able people are to let the other man's argument count, although this capacity is a fundamental and indispensable condition for any human community. Everyone who proposes to come to terms with himself must reckon with this basic problem. For, to the degree that he does not admit the validity of the other person, he denies the 'other' within himself the right to exist--and vice versa. The capacity for inner dialogue is a touchstone for outer objectivity."