1)
What is the meaning of "Mah Ahavti Sorasecha"?
1.
Radak: So much I loved Your Torah [that "I talk about it the entire day"].
2.
Malbim: Even though it already said many times that Toras is my delight, one can delight in a dear matter not due to love. Therefore, it says that my delight in Torah is due to my love of it.
2)
Is all his talk about Torah?