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Avoid connecting yourself with characters whose good and bad sides are unmixed and have not fermented together; they resemble vials of vinegar and oil; or palletts set with colors; they are either excellent at home and insufferable abroad, or intolerable within doors and excellent in public; they are unfit for friendship, merely because their stamina, their ingredients of character are too single, top much apart; let them be finely ground up with each other, and they are incomparable.
— JOHANN KASPAR LAVATER