Who Knows One? We All [Should] Know One!
The Gemara in Avodah Zara poses the following query: What is a ger toshav? A ger toshav is not obligated in all the mitzvos that a Yid is.
Yetzer Hara
Desires Behind Disbelief in the Gemara
The idea that heresy comes from a wish to be free of moral restraint, much as a bribe blinds even a wise judge.