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.

他有个成见，认为女人的天地是在家里。

He was the more surprised at his daughter's wanton play of a fixed idea.

女儿竟是这样放肆地表达她顽固不化的思想，使他感到格外惊讶。

As for Marius, as he allowed them to dress his wounds and care for him, he had but one fixed idea: Cosette.

至于马吕斯，他任凭别人替他包伤，护理，心里牢牢地只有一个念头：珂赛特。

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。