Thenceforth they thought that, rationally concluded, doubt could become an instrument of knowledge.

Meaning: The saying contrasts an Argus-like watcher at home with a mole abroad. It pictures someone sharply observant in familiar surroundings but much less perceptive elsewhere.

Meaning: An observer who appears inattentive may still be aware of what is happening. The cat’s momentary wink warns against treating a brief lapse in visible attention as proof that nothing has been noticed.

Meaning: The rhyme presents a spring ague as medicine fit for a king. It gives a feverish illness a surprising positive value rather than simply treating it as misfortune.

Meaning: The saying treats apples, eggs and nuts as acceptable after someone it calls a slut. It uses a demeaning label while making an unverified claim about food handled by another person.