en_tn/mat/12/45.md

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When an unclean spirit ... with this evil generation

Jesus tells a parable to warn the people of the danger of not believing him. (See: rc://en/ta/man/translate/figs-parables)

It will be just like that with this evil generation

This means that if the people of Jesus' generation do not believe him and become his disciples, they will be in a worse situation than they were before he came.