Our Lord tells us, that “every idle word that men speak, they will give account of in the day of judgment.” And He adds, “By your words you will be justified, and by your words you will be condemned.”
There are few of our Lord’s sayings which are so heart-searching as this. There is nothing, perhaps, to which most men pay less attention than their words. They go through their daily work, speaking and talking without thought or reflection, and seem to imagine that if they do what is right, it matters but little what they say.
But is it so? Are our words so utterly trifling and unimportant? We dare not say so, with such a passage of Scripture as this before our eyes. Our words are the evidence of the state of our hearts, as surely as the taste of the water is an evidence of the state of the spring. “Out of the abundance of the heart the mouth speaks.” The lips only utter what the mind conceives. Our words will form one subject of inquiry at the day of judgment. We shall have to give account of our sayings, as well as our doings. Truly these are very solemn considerations. If there were no other text in the Bible, this passage ought to convince us, that we are all “guilty before God,” and need a righteousness better than our own, even the righteousness of Christ. (Phil. 3:9.)
Expository Thoughts on the Gospels – Matthew (Edinburgh, Scotland; Banner of Truth; 1992) Commenting on Matthew 12:22-37. p. 132-133