Joseph Benson's Commentary of the Old and New Testaments - Matthew 12:36-37
Matthew 12:36-37. But I say unto you You may perhaps think God does not much regard your words, but I assure you, that not only for blasphemous and profane, malicious, false, slanderous, and reviling words, but for every idle word which men shall speak: for all light, vain, trifling expressions; for all useless, unprofitable conversation, and all discourse uttered without seriousness and caution, and which does not conduce to the glory of God and the good of mankind; that men shall speak... read more
Albert Barnes' Notes on the Whole Bible - Matthew 12:37
By thy words thou shalt be justified ... - That is, “words” are the indication of the true principles of the heart; by “words” the heart shall be known, as the tree is by its fruit. If they are true, proper, chaste, instructive, pious, they will prove that the heart is right. If false, envious, malignant, and impious, they will prove that the heart is wrong, and will therefore be among the causes of condemnation. It is not meant that words will be the only thing that will condemn man, but that... read more