The expression, “Know thyself,” some supposed to be Chilon’s. But Chamæleon, in his book About the Gods, ascribes it to Thales; Aristotle to the Pythian. It may be an injunction to the pursuit of knowledge. For it is not possible to know the parts without the essence of the whole; and one must study the genesis of the universe, that thereby we may be able to learn the nature of man. Again, to Chilon the Lacedæmonian they attribute, “Let nothing be too much.” Strato, in his book Of Inventions, ascribes the apophthegm to Stratodemus of Tegea. Didymus assigns it to Solon; as also to Cleobulus the saying, “A middle course is best.” And the expression, “Come under a pledge, and mischief is at hand,” Cleomenes says, in his book Concerning Hesiod, was uttered before by Homer in the lines: