ייִדישער מחשבֿה אויף ירמיהו 31:33

Also, [we need this allowance of eating meat] so long as the ethical recognition has not reached a clear status, so long as we have not reached that level that we have been promised about, that (Jeremiah 31:33) “I will place my Torah within them, and on their hearts I will write it,” which means that morality will then be felt with all of its brilliance in the hearts of man. (Jeremiah 31:34) “And they will no longer teach each other, a man to his fellow, a man to his brother, to say ‘Know God’, for everyone will know Me, from the smallest to the biggest.” And what is “knowledge of God”? The prophet has already taught us, (Jeremiah 9:23) “This is what a person can praise himself with. Think and know Me, for I am God, who does kindness, judgment, and righteousness in the land, for these I desire, says God.” Behold, it is the natural morality in its widened understanding that itself is truly “knowledge of God”! So long as man requires educators from the outside [to teach him] the obligations of human ethics and morality, he will also need many guards and fences so that the way that he lives does not get corrupted, as well as to make him ready to receive the appropriate and desired instruction. Sometimes, we also need to give up on some perceptible aspect of the ways of morality, in order to get humanity ready for an even higher level, because if we were to put first what should really come later, then we would lose everything.