1)
What is the meaning of "Atah Yadata l'Ivalti"?
1.
Radak: They are my foolish matters.
2.
Malbim: They are my doubts in investigation, via which his Emunah is flimsy.
2)
What are "Ashmosai"?
1.
Radak: They are my Shogeg sins. They are not hidden from You! You know that they blame me without reason.
2.
Malbim: They are my Aveiros of action. You know both my intellectual matters, and my actions that depend on time and place 1 .
1
After saying that Hashem knows matters in his heart, surely He knows his visible actions! (PF)