托利得定理由法国社会心理学家H·M·托利得提出。
测验一个人的智力是否属于上乘,只看脑子里能否同时容纳两种相反的思想,而无碍于其处世行事。思可相反,得须相成。
也有说法,这个定理是来自以下原文:
"The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function."--F. Scott
Fitzgerald出自菲茨杰拉德的散文集《崩溃》