One of the answers could be that he gave the teaching to people who had a very fixed idea of the existence of the universe or tried to explain the creation seen on a relative level.
一个可能的答案是,他教授的人是对宇宙实有有坚固信仰的人,或者是一个相对程度上看到的创世。
Second kind... fixed idea with a generally sane condition.
第二类…固执的想法,完全正常的身体状况。
He had the fixed idea that a woman's place was in the home.