Psalm 119:98. Thou through thy commandments hast made me wiser than mine enemies.
The commands were his book, but God was his teacher. The letter can make us knowing, but only the divine Spirit can make us wise. Wisdom is knowledge put to practical use. Wisdom comes to us through obedience: "If any man will do his will he shall know of the doctrine." We learn not only from promise, and doctrine, and sacred history, but also from precept and command; in fact, from the commandments we gather the most practical wisdom and that which enables us best to cope with our adversaries. A holy life is the highest wisdom and the surest defence. Our enemies are renowned for subtlety, from the first father of them, the old serpent, down to the last cockatrice that has been hatched from the egg; and it would be vain for us to try to be a match with them in the craft and mystery of cunning, for the children of this world are in their generation wiser than the children of light. We must go to another school and learn of a different instructor, and then by uprightness we shall baffle fraud, by simple truth we shall vanquish deep laid scheming, and by open candour we shall defeat slander. A thoroughly straightforward man, devoid of all policy, is a terrible puzzle to diplomatists; they suspect him of a subtle duplicity through which they cannot see, while he, indifferent to their suspicions, holds on the even tenor of his way, and baffles all their arts. Yes, "honesty is the best policy." He who is taught of God has a practical wisdom such as malice cannot supply to the crafty; while harmless as a dove he also exhibits more than a serpent's wisdom.
Charles Spurgeon, writing in The Treasury of David.