What are "Rosh Tzurim" and "Gevahos" referring to?
Rashi: "Rosh Tzurim" and "Gevahos" refer to their beginnings - the Avos and the Imahos, respectively 1 who form the powerful base from which Yisrael descended.
Ramban and Rashbam: 'Because I see them from the mountain-tops and from the top of the hill (that they are alone and other nations are not reckoned together with them - Rashbam). 2
Targum Yonasan: 'I see that this nation is led on the merit of the righteous Avos, who are compared to mountains, and of the Imahos who are compared to hills. 3
Lev Eliyahu (Bereishis p.101): Klal Yisrael is above nature
What does "Hen Am Levadad Yishkon" mean?
Rashi (citing Targum Onkelos): It means that they are a nation who on the merit of their ancestors, will inherit the World to Come alone.
Rashi #2: 'When Yisrael rejoice, no other nation rejoices together with them'. 1
Ramban: 'That they alone are as numerous as the dust of the earth, which nobody can count; neither can I count the four camps of Yisrael'. 2
Rashbam: Refer to 23:9:1:2.
Targum Yonasan: 'They alone will inherit the world to come because they do not live the lifestyle of the nations'.
Mishnas R. Aharon (4, p.25): The entire world was on one side, and Avraham was on the other side (Bereishis Rabah 42:8). This nature is an inheritance from the Avos. It is like a ladder to ascend the mountain of [Avodas] Hashem.
Yalkut Shimoni (768): 'Hen' in Greek means one. Yisrael are not considered with any other nation, like the letters of 'Hen'. Aleph joins with Tes (their combined Gematriya is 10), Beis with Ches
What is the meaning of "u'va'Goyim Lo Yischashav"?