Charles H. Spurgeon on Psalms 119:18

Thy law. That which is the object of the understanding prayed for, that in the knowledge whereof the Psalmist would be illuminated, is hrwt. The word signifies instruction; and being referred unto God, it is his teaching or instruction of us by the revelation of himself, the same which we intend by the Scripture. When the books of the Old Testament were completed they were, for distinction's sake, distributed into hrwt, Mybwtk, and Myaybg, or the "Law, "the "Psalms, "and the "Prophets, "Luke 24:44. Under that distribution Torah signifies the five books of Moses. But whereas these books of Moses were, as it were, the foundation of all future revelations under the Old Testament, which were given in the explication thereof, all the writings of it were usually called "the Law, "Isaiah 8:20. By the law, therefore, in this place, the Psalmist understands all the books that were then given unto the church by revelation for the rule of its faith and obedience. And that by the law, in the Psalms, the written law is intended, is evident from the first of them, wherein he is declared blessed who "meditates therein day and night, "Psalms 1:2; which hath respect unto the command of reading and meditating on the books thereof in that manner, Joshua 1:8. That, therefore, which is intended by this word is the entire revelation of the will of God, given unto the church for the rule of its faith and obedience that is, the holy Scripture.

In this law there are twalpg "wonderful things." alp signifies to be "wonderful, "to be "hidden, "to be "great" and "high; "that which men by the use of reason cannot attain unto or understand (hence twalpg are things that have such an impression of divine wisdom and power upon them as that they are justly the object of our admiration); that which is too hard for us as Deuteronomy 17:8, rkr Kmm alpy yk "If a matter be too hard for thee, "hid from thee. And it is the name whereby the miraculous works of God are expressed, Psalms 77:11 Psalms 77:78:11. Wherefore, these "wonderful things of the law" are those expressions and effects of divine wisdom in the Scripture which are above the natural reason and understanding of men to find out and comprehend. Such are the mysteries of divine truth in the Scripture, especially because Christ is in them, whose name is" Wonderful, "Isaiah 9:6; for all the great and marvellous effects of infinite wisdom meet in him. John Owen, 1616-1683.