Moussar sur Les Nombres 15:40

This can be explained, with the help of the L-rd, in various ways. [See what we have written above in the introduction.] It is written in Yerushalmi Peah 1:1 that just as the reward for Torah study is over and against all of the mitzvoth, so is the punishment for lashon hara over and against all of the transgressions. It is found, then, that just as Torah study is the greatest of all of the mitzvoth, so is lashon hara the severest of all of the sins. The reason, basically, is this: Just as with the elements that the blessed One has implanted in this world — fire, wind, water, and earth — the spiritual element is far stronger than the material so that the material is almost nothing compared to it, as we see plainly that when fire gets the upper hand over a material substance it destroys it, and, likewise, when the element of wind gets the upper hand, it can split mountains and break rocks, as it is written (I Kings 19:11): "And a great, strong wind, splitting mountains and breaking rocks," so is the thing with the "higher elements," such as tzitzith, lulav, shofar, and all the mitzvoth. Just as through them great things are worked in the higher worlds, and through them, too, a man is sanctified to the L-rd, as it is written (Numbers 15:40): "And you shall do all My mitzvoth and you shall be holy to your G-d," still, there is no comparison between them and Torah study, as we find in Yerushalmi Peah 1, that all of the mitzvoth are not comparable to one word of Torah. The reason is that all the mitzvoth are combined with matter. So that, for example, it is impossible to fulfill the mitzvah of tzitzith without donning a garment, which is material. And the same with succah and lulav, and thus with all of the mitzvoth. Not so with Torah study, which inheres in the faculty of speech, which is an abstract, "spiritual" faculty alone. For this reason its higher workings are awesome, wherefore the study of Torah is "over and against all." The reverse is true of kilkul ["damage"]. For with all of the organs through which he sins, because they are material, the kilkul wrought by them is not so [relatively] great. Not so, with the sin of lashon hara and rechiluth, which works purely through a spiritual agency, wherefore its kilkul in the higher worlds is awesome. Its punishment, therefore, correspondingly, is "over and against all."

And this is the intent of (Bamidbar 15:40): So that you remember and do all of My mitzvoth and you will be holy to your G-d." Now, ostensibly, "so that you remember and do all of My mitzvoth" is superfluous, for it is written [just] before (Ibid. 39): "and you will remember all the mitzvoth of the L-rd and you will do them." And it should have been written there "and you will be holy to your G-d." But, the verse [39] intimates to us something essential, i.e., when are the mitzvoth of so much avail that through them a man will be "holy to G-d"? When he takes heed not to go astray after the thoughts of his heart and the sight of his eyes. As Chazal have said on this verse, (Berachoth 12): "'After your hearts' — this is heresy;" 'and after your eyes' — this is adultery.'" And the Chinuch writes that included in "heresy" are all of the thoughts that run counter to the perspective of Torah, and included in "adultery" is pursuing the lusts of the world.

But still, one should not despair, even one for whom it is difficult to cleanse his thoughts and to entirely remove lewd thoughts from his heart. For if so, even His mitzvoth and his Torah would not avail to sanctify his soul, and how would he ever attain his end? But the major element here is Chazal's formula: "If one comes to cleanse himself he is helped [by Heaven]." And if he desires with his whole heart to remove lewd thoughts from it, he will certainly be aided by Heaven to do this, and he must not, G-d forbid, nullify any mitzvah or Torah, even though his thoughts are not entirely pure. In this connection Chazal have said (Pesachim 50b): "Let one always occupy himself with Torah and mitzvoth, even lo lishmah [not for the sake of Heaven], for from lo lishmah, lishmah [for the sake of Heaven] will follow." That is, the holiness of the Torah and the mitzvah will help him, so that it will be in his power to do and to learn for the sake of Heaven, too. And this is what is alluded to in the above verse itself. For, in the beginning it is written (Bamidbar 15:39): "And you will remember all the mitzvoth of the L-rd and you will do them." "the mitzvoth of the L-rd," implying for the sake of the L-rd, is written only in respect to remembering, but not in respect to doing, his not yet having attained purity of thought in the doing of the mitzvoth. In any event, the doing of these acts will bring him to remove the [impure] thoughts of the heart and to overcome his lusts, after which he will reach the level of (Ibid. 40): "and you will do all of My mitzvoth," the doing, too, being exclusively for the sake of the L-rd; and this will bring him to the level of holiness— "and you will be holy." However, all of this obtains only with one who comes to purify himself and strengthens himself to remove the lewd thoughts and to keep himself from [the gratification of] his lusts. (Only) then does "He who comes to purify himself" obtain.]