Knowledge rests not upon truth alone, but upon error also.

Meaning: The comparison questions an account offered without the experience or evidence needed for its subject. Its disability-based insult should be distinguished from that useful question.

Meaning: An outward container does not establish the quality of what is inside. Look for evidence about the substance rather than relying on packaging, appearance or a reassuring presentation.

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.