So speak ye. Some give this explanation, that as they flattered themselves too much, they are summoned to the right tribunal; for men absolve themselves according to their own notions, because they withdraw themselves from the judgment of the divine law. He then reminds them that all deeds and words are there to be accounted for, because God will judge the world according to his law. As, however, such a declaration might have smitten them with immoderate terror, to correct or mitigate what they might have thought severe, he adds, the law of liberty. For we know what Paul says, "Whosoever are under the law are under a curse." (Galatians 3:10.) Hence the judgment of the law in itself is condemnation to eternal death; but he means by the word liberty, that we are freed from the rigor of the law. This meaning is not altogether unsuitable, though if one examines more minutely what immediately follows, he will see that James meant another thing; the sense is as though he had said, "Except ye wish to undergo the rigor of the law, ye must be less rigid towards your neighbors; for the law of liberty is the same as the mercy of God, which delivers us from the curse of the law" And so this verse ought to be read with what follows, where he speaks of the duty of bearing with infirmities. And doubtless the whole passage thus reads well: "Since none of us can stand before God, except we be delivered and freed from the strict rigor of the law, we ought so to act, that we may not through too much severity exclude the indulgence or mercy of God, of which we all have need to the last."

So speak ye, and so do, as they that shall be judged by the law of liberty - On the phrase, "the law of liberty," see the notes at James 1:25. Compare the notes at James 4:11. The meaning is, that in all our conduct we are to act under the constant impression of the truth that we are soon to be brought into judgment, and that the law by which we are to be judged is that by which it is contemplated that we shall be set free from the dominion of sin. In the rule which God has laid down in his word, called "the law of liberty," or the rule by which true freedom is to be secured, a system of religion is revealed by which it is designed that man shall be emancipated not only from one sin, but from all. Now, it is with reference to such a law that we are to be judged; that is, we shall not be able to plead on our trial that we were under a necessity of sinning, but we shall be judged under that law by which the arrangement was made that we might be free from sin. If we might be free from sin; if an arrangement was made by which we could have led holy lives, then it will be proper that we shall be judged and condemned if we are not righteous. The sense is, "In all your conduct, whatever you do or say, remember that you are to be judged, or that you are to give an impartial account; and remember also that the rule by which you are to be judged is that by which provision is made for being delivered from the dominion of sin, and brought into the freedom of the gospel." The argument here seems to be, that he who habitually feels that he is soon to be judged by a law under which it was contemplated that he might be, and should be, free from the bondage of sin, has one of the strongest of all inducements to lead a holy life.

So speak ye, and so do - Have respect to every commandment of God, for this the law of liberty - the Gospel of Jesus Christ, particularly requires; and this is the law by which all mankind, who have had the opportunity of knowing it, shall be judged. But all along St. James particularly refers to the precept, Thou shalt love thy neighbor as thyself.

(7) So speak ye, and so do, as they that shall be judged by the law of liberty.
(7) The conclusion of the whole treatise: we are upon this condition delivered from the curse of the law by the mercy of God, that in the same way we should maintain and cherish charity and good will towards one another, and whoever does not do so, shall not taste of the grace of God.

So speak ye, and so do,.... Both words and actions should be taken care of; it becomes men to observe what they say, and what they do; for both sinful words and works are transgressions of the law, and will be brought to judgment; every idle word, as well as every evil work, both open and secret, men must give an account of in the day of judgment: wherefore it is incumbent on them so to behave,
as they that shall be judged by the law of liberty: See Gill on James 1:25 with which compare Romans 2:12. Heathens will be judged by the law of nature, Jews by the law of Moses, and those who live under the Gospel dispensation, according to the Gospel of Christ.

Summing up of the previous reasonings.
speak--referring back to James 1:19, James 1:26; the fuller discussion of the topic is given James 3:5-12.
judged by the law of liberty-- (James 1:25); that is, the Gospel law of love, which is not a law of external constraint, but of internal, free, instinctive inclination. The law of liberty, through God's mercy, frees us from the curse of the law, that henceforth we should be free to love and obey willingly. If we will not in turn practice the law of love to our neighbor, that law of grace condemns us still more heavily than the old law, which spake nothing but wrath to him who offended in the least particular (James 2:13). Compare Matthew 18:32-35; John 12:48; Revelation 6:16, "Wrath of the (merciful) Lamb."

So speak and act - In all things. As they that shall be judged - Without respect of persons. By the law of liberty - The gospel; the law of universal love, which alone is perfect freedom. For their transgressions of this, both in word and deed, the wicked shall be condemned; and according to their works, done in obedience to this, the righteous will be rewarded.