"The material world," continued Dupin, "abounds with very strict analogies to the immaterial; and thus some color of truth has been given to the rhetorical dogma, that metaphor, or simile, may be made to strengthen an argument, as well as to embellish a description. The principle of the vis inertiae, for example, seems to be identical in physics and metaphysics. It is not more true in the former, that a large body is with more difficulty set in motion than a smaller one, and that its subsequent momentum is commensurate with this difficulty, than it is, in the latter, that intellects of the vaster capacity, while more forcible, more constant, and more eventful in their movements than those of inferior grade, are yet the less readily moved, and more embarrassed and full of hesitation in the first few steps of their progress.

— Poe, The Purloined Letter

Tom: "Diana, have you ever confronted a moral dilemma?"

Diana: "I have spent my life confronting real dilemmas. I have always found moral dilemmas to be the indulgence of the well-fed middle class."

— Waiting for God (TV Series)

Any collocation of persons, no matter how numerous, how scant, how even their homogeneity, how firmly they profess common doctrine, will presently reveal themselves to consist of smaller groups espousing variant versions of the common creed; and these sub-groups will manifest sub-sub-groups, and so to the final limit of the single individual, and even in this single person conflicting tendencies will express themselves.

— Jack Vance, The Languages of Pao