1)
What is the meaning of "va'Ehi Nagu'a"?
1.
Radak: I am good, and I am stricken in the hands of the evil!
2.
Malbim: I am afflicted, without any sin.
2)
When is "Tochachti"?
1.
Rashi: My rebuke is seen constantly. Every morning I have new afflictions.
2.
Radak: I am stricken every day; also, every morning, i.e. every day, my afflictions are in their hands.
3.
Malbim: Even though I am afflicted without reason, these afflictions are Musar for me every morning. I think that there are no afflictions without sin, and I investigate my deeds and strive harder to fear Hashem, even though the absolute Resha'im do great Aveiros and succeed.