Nothing has such power to broaden the mind as the ability to investigate systematically and truly all that comes under thy observation in life.

Marcus Aurelius Antoninus (121-180 a d): Meditations. iii. 11.

  It was a common saying of Myson that men ought not to investigate things from words, but words from things; for that things are not made for the sake of words, but words for things.

Diogenes Laertius (Circa 200 a d): Myson. iii.