Quote from the Gemara – mekor for the issur of hesach ha’daas. Machlokes Rishonim about the geder of hesach ha’daas. Contradiction in the Rambam and also in the Tur. A new approach in the geder of hesach ha’daas, leading to no machlokes. This answers the contradiction in the Rambam and the Tur. This drasha imparts a strong message to the bachur about the purpose of tefilin, namely, to bring him to a higher level of yiras shamayim.