Adam Clarke on Job 5:2

For wrath killeth the foolish man - Foolish, silly, and simple, are epithets given by Solomon to sinners and transgressors of all kinds. Such parallelisms have afforded a presumptive argument that Solomon was the author of this book. See the preface. The words of Eliphaz may be considered as a sort of maxim, which the wisdom and experience of ages had served to establish; viz., The wrath of God is manifested only against the wicked and impious; and if thou wert not such, God would not thus contend with thee.