3:18a Let no one deceive himself.

I do not want anyone to keep deceiving himself.
-or-
Stop deluding yourselves.

3:18b If any of you thinks he is wise in this age,

Any of you who considers himself to be wise according to the standards/opinion of this age/world
-or-
Some of you consider yourselves to be wise, in the way that people of this world think about wisdom.

3:18c he should become a fool,

must become one who is thought foolish.
-or-
You must be willing to ⌊stop thinking like this and⌋ let others/unbelievers consider you to be foolish

3:18d so that he may become wise.

In that way you may become wise ⌊in God’s opinion⌋.
-or-
so that God can make you truly wise.

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