1)
How would he strengthen them with his mouth?
1.
Malbim: One who is afflicted without reason, if he sees that all recognize this, that he is innocent, this strengthens him.
2)
What is "Nid Sefasai"?
1.
Rashi: I wander, complain and scream, and then cease.
2.
Ibn Ezra: This is like Tenudah - to rebuke them.
3.
Malbim: If my lips would weary from all my talk [to strengthen you], and I could not speak more, I would still toil to strengthen you.
