Charles H. Spurgeon on Psalms 140:3

In St. James's day, as now, it would appear that there were idle men and idle women, who went about from house to house, dropping slander as they went, and yet you could not take up that slander and detect the falsehood there. You could not evaporate the truth in the slow process of the crucible, and then show the residuum of falsehood glittering and visible. You could not fasten upon any word or sentence, and say that it was calumny; for in order to constitute slander, it is not necessary that the word spoken should be false —half truths are often more calumnious than whole falsehoods. It is not even necessary that a word should be distinctly uttered; a dropped lip, an arched eyebrow, a shrugged shoulder, a significant look, an incredulous expression of countenance, nay, even an emphatic silence, may do the work; and when the light and trifling thing which has done the mischief has fluttered off, the venom is left behind, to work and rankle, to inflame hearts, to fever human existence, and to poison human society at the fountain springs of life. Very emphatically was it said by one whose whole being had smarted under such affliction, Adders' poison is under their lips. —Frederick William Robertson.