Introversion

Definition and stakes

Sarah Sheppard,  Characteristics of The Genius and Writings of L. E. L. (1841)

“ When such persons are compelled to a moral introversion, to a turning from the glittering exterior of earthly things, to fast-fading impressions on their own minds,—from the gay dissonance of outward but hollow mirth to the still solemn voice of their own hearts, echoing "All is vanity!"—then do they accuse of needless melancholy the cause that has been instrumental in arresting for a moment their thoughtful attention. ”
Source: Wikisource

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