(Devarim, Ibid.) "and you will inherit nations greater and mightier than you": "great" in stature, and "mighty" in strength. "than you": You, too, are great and mighty, but they are greater than you. R. Eliezer b. Yaakov says: As when one says: "That man is stronger than this one." (The intent is:) This one, too, is strong, but the other is stronger.
Variantly: "and mightier than you (plural)." Why is this written again? Is it not already written (Ibid. 7:1) "seven nations more numerous and mightier than you (singular)"? To teach that one of the seven nations was greater and more formidable than all of Israel. And thus is it written (Amos 2:9) "And I destroyed the Emori from before them whose height was like the height of the cedars and who was strong as the oaks."