When a person cheers himself with the joy of mitzvah, and the joy is so great that it reaches down to his feet—i.e., he dances for joy—this concept is called “and a prophet to a heart of wisdom” (Psalms 90:12). The feet are Netzach and Hod, the concept of prophets. They ascend to the concept of the heart through the joy in the heart, because the joy elevates them. This is the dance—that he keeps picking up his feet.

Thus, when he studies Torah or performs a mitzvah with such great joy that the joy reaches down to his feet and raises his feet up—through this all those who support Torah, who are called “supporters of truth,” are elevated. This is the meaning of “tzedek (righteousness) called to his feet” (Isaiah 41:2), because Torah and mitzvah are called tzedek, as our Sages, of blessed memory, taught: “You should be speaking tzedek” (Psalms 58:2) …. And as it is written, “for all Your mitzvot are tzedek (righteous)” (ibid. 119:172).

Evil speech, too, is called ReGeL (foot), as it is written, “He that did not RaGaL (slander) with his mouth” (ibid. 15:2). It, too, is raised up.

A person is also raised up by money, which is called “foot,” as it is written, “and all the subsistence at their feet” (Deuteronomy 11:6).

Also, all the lower levels, which are referred to as “feet,” are elevated through the joy of Torah and mitzvah, as it is written, “tzedek called to his feet .” Torah and mitzvah call on those lower levels to ascend.

And this is as our Sages, of blessed memory, taught: One who has no sons should make his wife happy in the mitzvah (Bava Batra 10b). For a wife is called “foot,” as it is written, “He safeguards the feet of His pious ones” (1 Samuel 2:9). It follows that through the joy he elevates and binds her to the concept of tzedek, which is called heh. That is the source of seed, as it is written, “Heh (Here) you have seed” (Genesis 47:23).

Also, a son is the leg of his father (Eruvin 70b).

Faith, too, is called “foot.” As our Sages, of blessed memory, taught: Chabakkuk came and stood them on one… (Makkot 24a).

{Similarly,} everything that is called “foot” is elevated.