Job 5:3

the foolish Rather perhaps, a foolish man, the same word as in Job 5:2. Eliphaz cites an instance from his own experience confirming the truth stated in Job 5:2. He saw a man of this character taking root, and for the moment appearing to give promise of prosperity.

but suddenly I cursed The meaning is not that Eliphaz cursed his habitation before-hand, foreseeing that destruction would certainly overtake him; but that, though this fool appeared prosperous and seemed preparing for enduring happiness, suddenly God's judgment fell on him, and Eliphaz, seeing his desolation and knowing the true meaning of it, pronounced his habitation accursed; and this he did "suddenly," so speedily in the midst of his apparent luxuriance did the curse of God wither up the prosperity of the fool.