Alciato's Book of Emblems

Emblem 16

Be sober and remember not to be too rashly credulous: these are the limbs of the mind

Do not be credulous, do not be incautious, says Epicharmus - these will be the sinews and the limbs of the human mind. Behold the hand with the eye, believing what it sees, behold the pennyroyal, herb of ancient sobriety. By displaying it Heraclitus calmed the crowd and charmed it, though it was threatening with swelling sedition.