en_tn/1co/03/18.md

Let no man deceive himself

Nobody should believe the lie that he himself is wise in this world.

in this age

"now"

let him become a "fool" that he may become wise

"that person should accept what the world thinks is foolishness, in order to gain God's true wisdom" (See: rc://en/ta/man/translate/figs-irony)

"He catches the wise in their craftiness"

God traps the people who think they are clever, and uses their own schemes to trap them.

"The Lord knows that the reasoning of the wise"

AT:"The Lord know the plans of people who think they are wise" or "The Lord overhears all the planning of the wise" (UDB)

futile

"useless." AT: "worthless" or "pointless."