Apollonius and Iamblichus held that it was not “in the knowledge of things _without_, but in the perfection of the soul _within_, that lies the empire of man, aspiring to be more than men.”[140] Thus they had arrived at a perfect cognizance of their godlike souls, the powers of which they used with all the wisdom, outgrowth of esoteric study of the hermetic lore, inherited by them from their forefathers. But our philosophers, tightly shutting themselves up in their shells of flesh, cannot or dare not carry their timid gaze beyond the _comprehensible_. For them there is no future life; there are no godlike dreams, they scorn them as unscientific; for them the men of old are but “ignorant ancestors,” as they express it; and whenever they meet during their physiological researches with an author who believes that this mysterious yearning after spiritual knowledge is inherent in every human being, and cannot have been given us utterly in vain, they regard him with contemptuous pity. Says a Persian proverb: “The darker the sky is, the brighter the stars will shine.” Thus, on the dark firmament of the mediæval ages began appearing the mysterious Brothers of the Rosie Cross. They formed no associations, they built no colleges; for, hunted up and down like so many wild beasts, when caught by the Christian Church, they were unceremoniously roasted. “As religion forbids it,” says Bayle, “to spill blood,” therefore, “to elude the maxim, _Ecclesia non novit sanguinem_, they burned human beings, as burning a man does not _shed his blood_!” Many of these mystics, by following what they were taught by some treatises, secretly preserved from one generation to another, achieved discoveries which would not be despised even in our modern days of exact sciences. Roger Bacon, the friar, was laughed at as a quack, {65} and is now generally numbered among “pretenders” to magic art; but his discoveries were nevertheless accepted, and are now used by those who ridicule him the most. Roger Bacon belonged by right if not by fact to that Brotherhood which includes all those who study the occult sciences. Living in the thirteenth century, almost a contemporary, therefore, of Albertus Magnus and Thomas Aquinas, his discoveries—such as gunpowder and optical glasses, and his mechanical achievements—were considered by every one as so many miracles. He was accused of having made a compact with the Evil One.