Commentaries:
Barnes' Notes
I delight to do thy will, O my God - To wit, in obeying the law; in submitting to all the trials appointed to me; in making an atonement for the sins of men. See the notes at Hebrews 10:7. Compare Philippians 2:8; Matthew 26:39.
Yea, thy law is within my heart - Margin, "In the midst of my bowels." So the Hebrew. The idea is, that the law of God was within him. His obedience was not external, but proceeded from the heart. How true this was of the Redeemer it is not necessary here to say.
DISCLAIMER: Church of the Great God (CGG) provides these resources to aid the individual in studying the Bible. However, it is up to the individual to "prove all things, and hold fast to that which is good" (I Thessalonians 5:21). The content of these resources does not necessarily reflect the views of CGG. They are provided for information purposes only.