וִידֵ֤י מֹשֶׁה֙ כְּבֵדִ֔ים וַיִּקְחוּ־אֶ֛בֶן וַיָּשִׂ֥ימוּ תַחְתָּ֖יו וַיֵּ֣שֶׁב עָלֶ֑יהָ וְאַהֲרֹ֨ן וְח֜וּר תָּֽמְכ֣וּ בְיָדָ֗יו מִזֶּ֤ה אֶחָד֙ וּמִזֶּ֣ה אֶחָ֔ד וַיְהִ֥י יָדָ֛יו אֱמוּנָ֖ה עַד־בֹּ֥א הַשָּֽׁמֶשׁ׃
摩西的手發沉，他們就搬來一塊石頭放在他底下，他就坐在上面；亞倫和戶珥扶著他的手，一個在這邊，一個在那邊。這樣，他的手就一直堅定不移，直到日落。
Shenei Luchot HaBerit
What is required in addition to remorse, is the forsaking of evil and the performance of good deeds. One needs to hold on to the pillar of Torah which is the banner of true freedom, i.e. freedom from the evil urge. We are capable of performing mighty deeds as long as we embrace Torah with our right hand, paraphrasing the words of Moses describing G–d's mighty deeds: ימינך ה' נאדרי בכח ימינך ה' תרעץ אויב. Our sages (Midrash Hagadol) in commenting on Genesis 27,22: הקול קול יעקב והידים ידי עשו, "The voice is the voice of Jacob, whereas the hands are the hands of Esau," interpret this phrase to mean that as long as the voice is the voice of Jacob, the hands of Esau are powerless against us.