Robert Burton, The Anatomy of Melancholy (Preface):
Democritus, as he is described by Hippocrates and Laertius, was a little wearish old man, very melancholy by nature, averse from company in his latter days, and much given to solitariness, a famous philosopher in his age, coaevus with Socrates, wholly addicted to his studies at the last, and to a private life: wrote many excellent works, a great divine, according to the divinity of those times, an expert physician, a politician, an excellent mathematician, as Diacosmus and the rest of his works do witness. He was much delighted with the studies of husbandry, saith Columella, and often I find him cited by Constantinus and others treating of that subject. He knew the natures, differences of all beasts, plants, fishes, birds; and, as some say, could understand the tunes and voices of them.
In a word, he was omnifariam doctus, a general scholar, a great student; and to the intent he might better contemplate, I find it related by some, that he put out his eyes, and was in his old age voluntarily blind, yet saw more than all Greece besides, and writ of every subject, Nihil in toto opificio naturae, de quo non scripsit. A man of an excellent wit, profound conceit; and to attain knowledge the better in his younger years, he travelled to Egypt and Athens, to confer with learned men, “admired of some, despised of others.” After a wandering life, he settled at Abdera, a town in Thrace, and was sent for thither to be their lawmaker, recorder, or town-clerk, as some will; or as others, he was there bred and born. Howsoever it was, there he lived at last in a garden in the suburbs, wholly betaking himself to his studies and a private life, “saving that sometimes he would walk down to the haven,” “and laugh heartily at such variety of ridiculous objects, which there he saw.” Such a one was Democritus.