There were two thoughts in the Psalmist's mind:
I. That there was something in the world which he must learn and would learn, for everything in this life and the next depended on his learning it. And this thing which he wants to learn he calls God's statutes, God's law, God's testimonies, God's commandments, God's everlasting judgments. That is what he feels he must learn, or else come to utter grief, both body and soul.
II. That if he is to learn them, God Himself must teach them to him. The Psalmist held that a man could see nothing unless God showed it to him. He held that a man could learn nothing unless God taught him, and taught him, moreover, in two ways: first taught him what he ought to do, and then taught him how to do it.
III. We must learn: (1) God's law. The moment you do wrong you put yourself under the Law, and the Law will punish you. Therefore your only chance for safety in this life and for ever is to learn God's laws and statutes about your life, that you may pass through it justly, honourably, virtuously, successfully. (2) God's commandments. "If thou wilt enter into life, keep the commandments." (3) God's testimonies; what He has witnessed and declared about Himself and His own character: His power and His goodness, His severity and His love. (4). God's judgments; the way in which He rewards and punishes men. The Bible is full of accounts of the just and merciful judgments of God.
IV. God has not only commanded us to learn; He has promised to teach. He who wrote the hundred and nineteenth Psalm knew that well, and therefore his psalm is a prayer for teaching and a prayer for light.
C. Kingsley, Westminster Sermons,p. 120.