John Calvin Commentary Psalms 119:97

"Oh how love I thy law! It is my meditation all the day." — Psalms 119:97 (ASV)

O how have I loved thy law! Not content with a simple affirmation, the prophet exclaims, in the form of a question, that he was inflamed with incredible love for the law of God. As proof of this, he adds that he continually meditated on it.

If anyone boasts that he loves the Divine Law, yet neglects its study and applies his mind to other things, he reveals the grossest hypocrisy. For the love of the law, and especially such an ardent love for it as the prophet here expresses, always produces continual meditation on it.

And certainly, unless God’s law inflames and captivates our hearts with love for it, many allurements will quickly steal upon us and lead us away to vanity. The prophet, then, here commends such a love of the law that, possessing all our senses, effectually excludes all the deceits and corruptions to which we are otherwise too much inclined.