Delusion (n.) carries a grain of truth: the patient's conviction is justified, but the truth returns distorted, its certainty attached to a substitute.
Delusion (n.) contains a piece of forgotten truth, distorted on its return; the delusion's compulsive conviction flows from that core of truth and spreads to the errors wrapped around it.
A Delusion (n.) that cannot even in principle be unmasked is no delusion.
A Delusion (n.) is a patch laid over the place where the ego's tie to reality first tore.
A Fallacy (n.) can be the Capitol: when Epictetus pleaded that a missing step was hardly burning down the Capitol, Rufus answered that here the missing step was the Capitol.
Fallacy (n.) given free play in consciousness is comic, because a preconscious cathexis costs more to set up than an unconscious one.
A Fallacy (n.) is not less of a fallacy for being fashionable.
Folly (n.) creeps toward wisdom, but wisdom does not fall back into folly.
Folly (n.) and "I think" are interchangeable in the prereflexive cogito; folly separates from reason only when Descartes reflects on the cogito.
Folly (n.) grows more grass for the philosopher in its green valleys than cleverness does on its barren heights, and one should always come down from those heights.
Folly (n.) is the ego bending itself out of shape to avoid a break with its masters, which is why human follies look like the perversions.
A Gaffe (n.) is judged less by what was said than by who clipped it.
A Gaffe (n.) is a sentence that works harder for your opponent than anything his staff wrote.
A Gaffe (n.) gets quoted more often than the speech it interrupted.
A Gaffe (n.) is like a zipper that fails one tooth and takes the whole front with it.
8 concepts in this list.