Charles H. Spurgeon on Psalms 58:4

The deaf adder. Certain it is, says a modern writer upon the Psalms, that the common adder or viper here in England, the bite of which too, by the way, is very venomous, if it is not wholly deaf, has the sense of hearing very imperfectly. This is evident from the danger there is of treading upon these animals, unless you happen to see them; for if they do not see you, and you do not disturb them, they never endeavour to avoid you, which when they are disturbed and do see you, they are very solicitous of doing. Allowing, then, that there is a species of these noxious animals, which either not having the sense of hearing at all, or having it only in a low degree, may very well be said to be deaf; this may help to explain the present poetical passage of the psalmist. He very elegantly compares the pernicious and destructive practices of wicked men to the venom of a serpent; and his mentioning this species of animals, seems to have brought to his mind another property of at least one sort of them, in which they likewise resembled perverse and obstinate sinners, who are deaf to all advice, utterly irreclaimable, and not to be persuaded. This the adder resembled, which is a very venomous animal, and moreover is deaf, or very near it. And perhaps his saying that she stoppeth her ear, may be no more than a poetical expression for deafness; just as the mole, which in common speech is said to be blind, might in a poetical phrase, be said to shut her eyes; as in fact she does when you expose her to the light. The next clause, Which refuseth to hear, etc., is another poetical expression for the same thing. Samuel Burder, in "The Scripture Expositor," 1810.