After Paul’s admonition to “obey”, he noted his own previous “foolish” state as a sinner. It is interesting to note his description, starting with the word “foolish” – unintelligent or unwise.
His foolishness led to disobedience – he had not complied to the will of God. He was contumacious – stubborn willful against authority. He was deceived – led away from the truth. He served his own desires and pleasures. In effect, he did what pleased himself, not what pleased God. He lived in malice – malignity, ill-will, a desire to injure; and envy – ill will, jealousy, spite. He was hateful – detestable or odious; and was actively involved in hating others.
Verses 4-7 indicate a change. This is conversion. But, prior to it Paul was like everyone else. By not serving God he was serving himself. He caused injury to the cause of Christ. “I am Jesus, whom you are persecuting” (Acts 9:5). Paul was honest in assessing himself, this led him to call others to righteousness!