1)
What is the meaning of "Eshta'asha [b'Mitzvosecha]"?
1.
Rashi (16): I will engage, like "v'Al Yish'u b'Divrei Shaker" (Shemos 5:9).
2.
Radak (16): I get Simchah. Radak (here) - when I am alone (I delight in them).
3.
Malbim: They are like a matter of amusement, since I love them.
2)
What is the Chidush "Asher Ahavti"?
1.
Radak: I love them more than other things.
