Numbers were held to contain the essence of things, and the marvellous powers of four, seven, and ten received honor from all sects and schools. Words, too, were regarded almost as a mystic power, distinct from thought, incorporeal things which made thought real and gave it expression. The mystical susceptibility of Philo to the power of numbers has been noticed by every critic and exaggerated by not a few; his mystical valuation of words and speech, though far more important in his thought, has been commonly passed over. The analysis which Greek writers made of the relation between the mental thought, the sound which utters it, and the mind which thinks it, was invested with special importance for the Jewish thinker, who transferred it from the human to the Divine sphere. He applied it to interpret the constant Biblical phrases "and God said" or "and God spoke," according to notions in which philosophy and theology are mixed; and propounded a mystic idealism and a mystic cosmology, in which God's thought or comprehensive Word becomes the archetype of the visible universe, His single words the substantive universe and the laws of nature. A century before Philo, Aristobulus--assuming the genuineness of his Fragments--wrote:[198] "We must understand the Word of God, not as a spoken word, but as the establishment of actual things, seeing that we find throughout the Torah that Moses has declared the whole creation to be words of God." Philo, following his predecessor, says, "God speaks not words but things,"[199] and, again, commenting on the first chapter of Genesis, "God, even as He spake, at the same moment created."[200] And of human speech he has this pretty conceit a little before: "Into the mouth there enter food and drink, the perishable food of a perishable body; out of it issue words, immortal laws of an immortal soul, by which rational life is guided."[201] If human speech is "immortal law," much more is the speech of God. His words are ideas seen by the eye of the soul, not heard by the ear.[202] The ten commandments given at Sinai were "ideas" of this incorporeal nature, and the voice that Israel heard was no voice such as men possess, but the [Hebrew: shkina], the Divine Presence itself, which exalted the multitude.[203] Philo is here expanding and developing Jewish tradition. In the "Ethics of the Fathers" (v) we read: "By ten words was the world created"; and in the pages of the Midrash the [Hebrew: bt-kol], i.e._, the mystic emanation of the Deity, which revealed itself after the spirit of prophecy had ceased to be vouchsafed, is credited with wondrous and varied powers, now revealing the Decalogue, now performing some miracle, now appearing in a vision to the blessed, now prophesying the future fate of the race to a pious rabbi. The fertilizing stream of Greek philosophical idealism nourished the growth of the Jewish pious imagination, and in the Logos of Philo the fruit matured.