How will he find Chen in Hashem's eyes and in people's eyes?
R. Yonah #1: Via Chesed. Anyone who has mercy on the creations, they have mercy on him from Shamayim (Shabbos 151b) - v'Nasan Lecha Rachamim v'Richamcha v'Hirbecha" (Devarim 13:18), "Ka'asher Gadlah Nafshecha ha'Yom ha'Zeh b'Einai Kach Tigdal Nafshi b'Einei Hashem" (Shmuel I, 26:24). "Ta'avas Adam Chasdo" (below, 19:22) - this is a person's desire, like "Navu Lechayayich" (Shir ha'Shirim 1:10). One's desire, grace and beauty are according to his Chesed and generosity. "Vela'Anavim Yiten Chen" (34) - He will give to them grace in His eyes and in people's eyes. Good Midos draw Chen on a person. Via good and Chesed that one does with people, he finds grace in their eyes.
R. Yonah 1 #2: Via his Sechel, he finds grace in people's eyes - "Sechel Tov Yiten Chen" (13:15).
Malbim: Via Chachmah and human understanding, one can find Sechel, and grace in people's eyes. However, via Torah and Divine Chachmah, he finds grace also in Hashem's eyes.
According to the Magihah.
How will he find Sechel Tov in Hashem's eyes and in people's eyes?
R. Yonah: Via Emes. Those who go in the way of Emes, and vindicate the innocent and condemn the guilty, they have good Sechel. "U'Shmartem va'Asisem Ki Hi Chachmaschem u'Vinaschem" (Devarim 4:6), "Sechel Tov l'Chol Oseihem" (Tehilim 111:10). 1
Malbim: Sechel Tov is pouring Ru'ach Elokim on him, until he understands Emes with Divine help. It is via finding grace in Hashem's eyes!
R. Yonah: However, it says about those who support Sheker with their Chachmah "Chachamim Hem Lehara", "Hine bi'Dvar Hashem Ma'asu v'Chachmas Meh Lahem" (Yirmeyah 4:22, 8:9).