Charles H. Spurgeon on Psalms 58:4

Their poison is like the poison of a serpent. Is man also a poisonous reptile? Yes, and his venom is even as that of a serpent. The viper has but death for the body in his fangs; but unregenerate man carries poison under his tongue, destructive to the nobler nature. They are like the deaf adder that stoppeth her ear. While speaking of serpents the psalmist remembers that many of them have been conquered by the charmer's art, but men such as he had to deal with no art could tame or restrain; therefore, he likens them to a serpent less susceptible than others to the charmer's music, and says that they refused to hear reason, even as the adder shuts her ear to those incantations which fascinate other reptiles. Man, in his natural corruption, appears to have all the ill points of a serpent without its excellences. O sin, what hast thou done!