Spiritual knowledge: The commands of the LORD are radiant, giving light to the eyes. Psalm 19:8

Psalm 19 is a psalm dedicated to the Glory of God, the perfect fame. And this Glory is manifested in two senses, the first in the perfection of his works ("The heavens declare the glory of God; the skies proclaim the work of his hands.", Psalm 19:1) and the second in the excellence of the law bestowed on men.
God grants us the perfection of his spiritual law: "Fear God, and keep his commandments: for this is the whole duty of man", Ecclesiastes 12:13. The commandments are necessary but not sufficient; the sufficiency is in the fear of God (constancy, firmness, devotion, equanimity, stability). This spiritual gift completes the law and gives it life. The fear of the Lord is eternal and trustworthy because "He is the rock, his deeds are perfect", Deuteronomy 32:4.
God is perfect and transmits his qualities and perfections as the Sun transmits its rays to us explains the theologian Thomas Aquinas, that is why his law is radiant and expansive. The law gives light to the eyes of intelligence, gives guidance, and allows us to make better decisions.
The fulfillment of his law is the source of one of the greatest spiritual blessings, makes the naive and simple folk through the gift of Gnosis people endowed with wisdom, good discernment and knowledge, that is, the perfect law is the path to spiritual enlightenment.
But also the exercise of God's law is a source of great happiness, Aristoteles explains: "Happiness is the reward of virtue". And being the law source of all virtue, necessarily the Law is the source of the most perfect happiness.
Psalm 19 expresses this spiritual beauty in this way:
"The law of the LORD is perfect,
refreshing the soul.
The statutes of the LORD are trustworthy,
making wise the simple.
The precepts of the Lord are right,
giving joy to the heart.
The commands of the Lord are radiant,
giving light to the eyes.
The fear of the LORD is pure,
enduring forever.
The decrees of the LORD are firm,
and all of them are righteous.", Psalm 19:7-9

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