To distinguish the pretender in medicine from the true physician.

Every rig at the truckstop had custom-made mud-flaps.

Poor Arabs wondered why I had no mare; I forbore to puzzle them by incomprehensible talk of hardening myself, or confess I would rather walk than ride for sparing of animals:

, Folio Society, 2006, vol.1, p.57: Whereas the poore, the banished, and seely servants, live often as carelesly and as pleasantly as the other.