As Paul makes clear in Romans 1, our sinful nature makes excusing and even justifying our sins all too easy. Each person’s conscience is certainly a common grace from God that restrains much evil, yet the conscience may be easily seared by continual sin, making good judgment and proper knowledge unavailable. That is why the psalmist roots good judgment and knowledge in believing God’s commandments.
Teach me good judgment and knowledge,for I believe in your commandments.
Psalm 119:66 ESV
Having begun stanza teth by rejoicing in God’s good dealing with him, the psalmist now continues his prayer by making a petition: teach me good judgment and knowledge. This is a petition that all of God’s people ought to make alongside the psalmist, for we should all desire good judgment and knowledge.
Of course, we tend to first think of the life-altering judgments to be made that need to be informed by the knowledge and wisdom of God. Do I go to school A or school B? Is this the person that I should marry? Should we homeschool our children?
Yet the ability to make a proper judgment is also of use to us each day. We must decide from the moment that we awake whether we will reach for the Bible or for the phone.