Reference for Menachot 86:19

Rebbi Yehudah says, “A person is obligated to say [the following] three Berachot (blessings) every day: Baruch [Ata Hashem Eloheinu Melech Haolam] Shelo Asani Goy (Blessed are You Hashem, our God, King of the world, for not making me a gentile), Baruch [Ata Hashem Eloheinu Melech Haolam] Shelo Asani Isha (Blessed are You Hashem, our God, King of the world, for not making me a woman), Baruch [Ata Hashem Eloheinu Melech Haolam] Shelo Asani Bur (Blessed are You Hashem, our God, King of the world, for not making me a boor). [The reason for saying a Beracha for not making him] a gentile is because it says ‘All nations are like nothing to Him. He considers them to be empty and void.’ (Isaiah 40:17) [The reason for saying a Beracha for not making him] a woman is because women are not obligated in Mitzvot (commandments).” [The reason for saying a Beracha for not making him] a boor is because a boor is not afraid of sin. They have said a parable to what this is similar to. [It is similar] to a king of flesh and blood who said to his servant to cook him [some] food, but he (i.e. the servant) has never cooked food in his life. In the end he ruins the food and angers his master. [Or the king told the servant] to hem for him a robe, but he (i.e. the servant) has never hemmed a robe in his life. In the end he [causes] the robe to get dirty and angers his master.