Psalm 1:6

For the Lord knoweth the way of the righteous
The way in which he walks by faith, which is in Jesus Christ; the way in which he goes to the Father, and carries to him his sacrifices of prayer and praise, which meet with acceptance through him; the way in which he seeks for and expects justification, pardon, and salvation, namely, through the blood, righteousness, and sacrifice of Christ: and also it may denote his course, his walk and conversation; for the righteous man is a follower of God, he takes up the cross and follows after Christ: he walks not after the flesh, but after the Spirit, according to the rule of the word, and as becomes the Gospel of Christ: and this way of his in every sense the Lord "knows"; not merely as he is omniscient, for by his omniscience his eyes are upon the ways of all men; he knows the way of the wicked as well as the way of the righteous; but the sense is, that the Lord approves of and is well pleased with his way of faith and holiness; he knows this person, so as to love him and take delight and pleasure in him; his countenance beholds him with a smile; he is well pleased with him in Christ and for his sake, on whose account he has respect to him and to his offerings, to his service and duty, to his ways and works; and hence he is a blessed man, is in a happy situation, and all he does prospers, for he and his ways please the Lord: and hence also it is that neither he nor his way shall perish; the way he is in leads to everlasting life, and he being a follower of the Lord in a way pleasing to him, he shall never perish, but have eternal life;

but the way of the ungodly shall perish;
for his way is a wicked way, the way of sinners, ( Psalms 1:1 ) ; it leads to destruction and death, and all that walk in it shall perish; for if is a way the Lord knows not, does not approve of, he abhors it; wherefore the man that continues in it will be unhappy, wretched, and miserable to all eternity. These last words therefore show the reason of the happiness of one sort of men, and the unhappiness of the other; and prove and confirm the same: the Lord knows, approves of, loves, and delights in the one; he does not approve of and delight in the other.