Halakhah for Sanhedrin 42:16

And Ramban, may his memory be blessed, answered the challenges and clarified the matter clearly, completely and nicely. And this is his language that he wrote in his commentary of the Torah: That matter which Rambam, may his memory be blessed, wrote that the commandments have explanations is something very elucidated, as in each one there is an explanation and a benefit and a refinement for a person, besides the reward for them from the Commander, may He be blessed. And they, may their memory be blessed, have already said (Sanhedrin 21b), "For why did He not reveal the explanation of the commandments, etc.?" And they, may their memory be blessed, expounded (Pesachim 119a), "'And to the clothed elegantly' (which can also be read as, 'and to the one that covers the ancient' Isaiah 23:18) - this is [referring] to the one who covers that which the Ancient of Days (God) covered. And what are they? The explanations of the Torah." And they have already expounded about the red heifer (Bemidbar Rabbah 19:6) that Shlomo said, "I have discerned everything, but the section of the red heifer, I have investigated and asked and searched - 'I said that I could fathom it, but is far from me' (Ecclesiastes 7:23)." And Rabbi Yossi Bar Chinanah said, "The Holy One, blessed be He, said to Moshe, 'Go and I will reveal to you the explanation of the heifer, but to another, it will be a statute (that is not understood),' as it is written (Zechariah 14:6), 'In that day, there shall be neither sunlight nor cold moonlight' - things that are covered from you in this world, in the future you will gaze upon them in the world to come; like that blind man that becomes able to gaze, as it is written (Isaiah 42:16), 'I will lead the blind by a road they did not know.' And it is written (later in the same verse), 'I have done these words and I have not left them' - as I have already done them for Rabbi Akiva," meaning to say that Rabbi Akiva already knew them in this world.