Another matter, “see, I have begun” – this is what the verse said: “Expectation deferred sickens the heart” (Proverbs 13:12). Rabbi Azarya said: It is speaking of the salvation that is expected to come. How so? When the prophet says to Israel: “Another one will be soon, and I will quake the heavens, and the earth” (Haggai 2:6), they say: “Expectation deferred sickens the heart.”
When he said to them: “Behold, your Savior has come” (Isaiah 62:11), they said: “And desire realized is a tree of life” (Proverbs 13:12). Another matter, “expectation deferred” – this is Pharaoh, as Moses was coming and going and bringing plagues upon him, and with each and every plague, Israel believed that he would release them. “And desire realized is a tree of life” – this is the wars of Siḥon and Og, as the Holy One blessed be He said to him immediately: “See, I have begun delivering before you.”
Another matter, what is “see, I have begun”? The Holy One blessed be He said to Moses: ‘Moses, see that I have toppled their guardian angel.’ Rabbi Abba bar Kahana said: Like a king who ties up his son’s enemy, and says to him: ‘Do to him anything that you wish.’