1)
What is "Segadelenu"?
1.
Rashi: You put Your heart to inspect man's deeds every morning and every moment.
2.
Malbim: He refutes Elifaz' claim that there is Hashgachah. Man is not worthy for Hashem to oversee him constantly.
2)
Why did he add "v'Chi Sashis Elav Libecha"?
1.
Malbim: Man is not worthy for Hashem to heed him even occasionally.
