Part 2: On perspicaciousness (good judgment, perceptiveness), reasonableness, sagacity, savoir-faire, wisdom, and worldly wisdom

J

“Unroof your house and I will help you re-roof it” usually gives one only one bundle of thatching grass.
(One relies on other people's promise of help only at one's risk.)

Busily wagging tail, busily wagging tail, a goat enters a bachelor's house busily wagging its tail; what does a bachelor have to eat whose left-over the goat can have?
(One wastes one's time expecting some largesse from a destitute person.)