1)
Why did David call himself "Oni v'Evyon"?
1.
Rashi (40:18): Every "Oni v'Evyon" in Tehilim refers to Yisrael.
2.
Radak citing his father: His son expelled him from kingship.
3.
Malbim: I constantly need salvation.
4.
Malbim (40:18): Refer to 40:18:2:5. My enemies constantly pursue me, and I am poor and weak compared to them.
2)
Why did he ask that Hashem not delay?
1.
Seforno (40:18): The day is short, and there is much work for me to do.
2.
Malbim: I am poor, and I need salvation.
