These men did not wholly break with their past. They preserved many of their fathers' ceremonies; nay, they added many more, and developed a most complicated system of sacrificial ritualism. But there were many of them who saw through the shapes of the world and the sacrifices that controlled its weal a vision of the Infinite; and thus amidst the Brah manas, the lore of ritual, grew up the pantheism of the Upanishads.