A chassid related: I once sat in the Torah study hall of Rabbi Moshe Posner, the great-grandfather of the Alter Rebbe, and was studying with great concentration. By nature I studied very quickly and in a loud voice, and I understood the material clearly.

The Alter Rebbe, continued the chassid, sat in one of the nearby libraries. When I passed him, he told me that I am learning with great desire, but too quickly. I told the Alter Rebbe that it is my nature to be quick. He responded that I must change my nature. When I told him that I cannot, he responded: A Jew has the tools to change his nature and he can accomplish this through kabbalas ol (submitting to the yoke of Heaven). When one gets accustomed [to this new behavior,] it becomes second nature, and the nature that is created thereby changes one's innate nature. Kabbalas ol is the foundation of Torah and one's G-dly service.

The Alter Rebbe continued: Your desire to study Torah is a gift from Above. In the passage "Vaavadetem meheirah mei'al haaretz hatovah, asher A-donai nosein lachem - And you will swiftly perish from the good land that the L-rd gives you," the word eretz ("land") is connected to the word ratzon ("desire"), which alludes to the will and desire in studying Torah and serving G-d. And when G-d gives "the good land," i.e., a desire and will to study Torah, it must be "Vaavadetem meheirah," i.e., one must destroy and rid himself of "meheirah" (hastiness), and study Torah in delight to give pleasure to the neshamah.

Sefer HaSichos 5700, p. 59