“And he said unto them, I beheld Satan as lightning fall from heaven.” Luke 10:18
Satan underestimates and does not know the power of God and the grace of God. He believed Job would curse God if all he had was taken away, he believed he could take over the throne of God in a revolt, he believed if he killed Christ he would overthrow all God’s salvation of men, he believes he can deceive and devour God’s people ─ he is wrong on all counts. Because he is NOT omniscient, because he is a liar and deceives even himself, his thoughts are wrong, his evil is exposed, and it will not be long till he is publicly, eternally and finally exposed as wicked and banished to everlasting torment in the lake of fire.
We need to pray that more people will be shown by God how deceived they are in his camp, repent, believe and enlist under Christ.
For his part, that great saint Job, in and through his terrible affliction, did not know what glory he was giving God and how his life would impact many others who have lived with affliction ever since.