Who should hear this?
Radak: Also this applies to Bnei Galus. There is a Chidush in the repetition.
Malbim: "Yod'ei Tzedek" [have proper] deeds Bein Adam l'Chavero.
Why does it say "Torasi b'Libam"?
Radak: Those whom My Torah is in their hearts, not only in their mouths - they will see the salvation.
Malbim: This refers to Emunah, mindsets and obligatory Avodah Bein Adam la'Makom.
What is "Cherpas Enosh"?
Radak: The nations revile them about the delay [in] Galus. And so it says "Kol ha'Yom Kelimasi Negdi" (Tehilim 44:16).
Malbim #1: A lowly person reviles them for their hope.
Malbim #2: This corresponds to "Am Yod'ei Tzedek." They are reviled for their conduct with Midos and Tzedek.
What are "Gidufosam"?
Radak: This is like Cherpam (their insults).
Malbim: Giduf always refers to something with Kedushah. They revile "Am Torasi b'Libam" for their Kadosh Torah.