Commentators explain that "hatching adders' eggs" illustrates how sinful plans and false teachings can appear harmless or even appealing on the surface. Just as an egg's contents are hidden, the true, deadly nature of these schemes is only revealed upon participation ("he that eateth... dieth") or confrontation ("that which is crushed breaketh out into a viper"). This serves as a powerful warning to be discerning about the ideas and plans we embrace.