What is "l'Neged Einai"?
Radak: It is in my thoughts. His thoughts are clear in Chachmah and Ru'ach ha'Kodesh. The power of illustration is in the two chambers of the brain, which are opposite the eyes.
Malbim: This is the expectation for doing good. I did not have a base reason, like one who fasts for honor.
What are "[Asoh] Setim [Saneisi]"?
Rashi: This is like "Ki Sisteh Ishto" (Bamidbar 5:12) - veering from the path.
Radak: Asoh is Makor (like an infinitive) in place of a noun. They are deeds of Resha'im and those who veer.
Malbim: I did not veer from evil due to fear of punishment, rather, because I hate evil.
Why did he say "Lo Yidbak Bi"?
Radak, Malbim: They do not cling even to my thoughts.