Charles H. Spurgeon on Psalms 119:7

I will praise thee. From prayer to praise is here, a long or a difficult journey. Be sure that he who prays for holiness will one day praise for happiness. Shame having vanished, silence is broken, and the formerly silent man declares, "I will praise thee." He cannot but promise praise while he seeks sanctification. Mark how well he knows upon what head to set the crown. "I will praise thee." He would himself be praiseworthy, but he counts God alone worthy of praise. By the sorrow and shame of sin he measures his obligations to the Lord who would teach him the art of living so that he should clean escape from his former misery.

With up righteous of heart. His heart would be upright if the Lord would teach him, and then it should praise its teacher. There is such a thing as false and feigned praise, and this the Lord abhors; but there is no music like that which comes from a pure soul which standeth in its integrity. Heart praise is required, uprightness in that heart, and teaching to make the heart upright. An upright heart is sure to bless the Lord, for grateful adoration is a part of its uprightness; no man can be right unless he is upright towards God, and this involves the rendering to him the praise which is his due.

When I shall have learned thy righteous judgments. We must learn to praise, learn that we may praise, and praise when we have learned. If we are ever to learn, the Lord must teach us, and especially upon such a subject as his judgments, for they are a great deep. While these are passing before our eyes, and we are learning from them, we ought to praise God, for the original is not, "when I have learned, "but, "in my learning." While yet I am a scholar I will be a chorister: my upright heart shall praise thine uprightness, my purified judgment shall admire thy judgments. God's providence is a book full of teaching, and to those whose hearts are right it is a music book, out of which they chant to Jehovah's praise. God's word is full of the record of his righteous providence, and as we read it we feel compelled to burst forth into expressions of holy delight and ardent praise. When we both read of God's judgments and become joyful partakers in them, we are doubly moved to song song in which there is neither formality, nor hypocrisy, nor lukewarmness, for the heart is upright in the presentation of its praise.