Musar do Powtórzonego Prawa 19:9

The Torah exhorts us many times on the clinging [to G-d]: "to love the L-rd your G-d.. and to cling to Him" (Devarim 30:20), "to Him shall you cling" (Devarim 10:20, 13:5). And David said: "my soul clings to You" (Tehilim 63:9). All these verses speak of one matter, namely, the clinging with which a man clings to G-d, blessed be He, to such an extent that he is unable to part or move from Him.

And, in truth, since the Holy One Blessed be He created a man in His image, as written in the Torah, he must liken himself to the Blessed Creator in every way that he can. And it is because of the greatness of this trait ["to walk in His ways"], which is the fundamental principle in the service of the Blessed L-rd, that Scripture singled it out (in Devarim 19:9) — "and to walk in His ways all of the days." That is, it is not sufficient that one be adventitiously a good man, merciful, gracious, abundant in lovingkindness and the like, but "all of the days" he must take care to cultivate this holy trait of walking in His ways. And as to the rest of the mitzvoth, even though he must keep them, too, all of the days, Scripture did not single out each mitzvah by itself [(for "all of the days")], but spoke of them only collectively, in (Devarim 29:28): "The hidden things are for the L-rd our G-d, but the revealed ones are for us and our children forever, to do according to all the words of this Torah." The reason is as we have written.