Deuteronomy 10:16 Commentary: Rashi, Ramban, Sforno & Tur HaArokh

ערלת לבבכם [YE SHALL CIRCUMCISE] THE FORESKIN OF YOUR HEART — This means: ye shall remove the closure and cover that is on your hearts, [which prevent My words gaining entrance to them] (cf. Rashi on Exodus 6:12 and Leviticus 19:23).

CIRCUMCISE THEREFORE THE FORESKIN OF YOUR HEART — that your heart be open to know the truth, not as you have done to this day, for the Eternal hath not given you a heart to know, and eyes to see, and ears to hear [unto this day].²⁵²Further, 29:3.

ומלתם את ערלת לבבכם, therefore, it is appropriate that you remove the “foreskin,” prejudices with which your intelligence is afflicted, so that you will realise the errors you have made in your world outlook based on false premises.