That they might observe his statutes, and keep his laws. Praise you the LORD.
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Augustine of Hippo
AD 430
33. ..."That they may keep His statutes,and seek out His law" (ver. 45). Lastly, since by the seed of Abraham he wished those to be understood here, who were truly the seed of Abraham, such as were not wanting even in that people; as the Apostle Paul clearly showeth,when he saith, "But not in all of them was God well pleased;" for if He was not pleased with all, surely there were some in whom He was well pleased: since then this Psalm praiseth such men as this, he hath said nothing here of the iniquities and provocations and bitterness of those with whom God was not well pleased. But since not only the justice but also the mercy of Almighty God, the merciful, was shown even unto the wicked; concerning these attributes the rest of the Psalm pursueth the praises of God. And yet both sorts were in one people: nor did the latter pollute the good with the contagion of their iniquities. For "the Lord knoweth who are His;" and if he cannot separate in this world from wicked men, yet, "let eve...
His justifications. That is, his commandments: which here, and in many other places of the Scripture, are called justifications, because the keeping of them make men just. The Protestants render it by the word statutes, in favour of their doctrine, which does not allow good works to justify. (Challoner)
The design of God in granting Chanaan to the Israelites, was to encourage them to preserve the true religion. (Calmet)