en_tn/jer/23/17.md

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They are constantly saying

The word "constantly" is an exaggeration to emphasize that this is what they normally say. (See: rc://en/ta/man/translate/figs-hyperbole)

everyone walking in the stubbornness of his own heart says

Here "heart" refers to their desires. To follow those desires is spoken of as walking in them. AT: "everyone stubbornly does whatever they desire to do" (See: rc://en/ta/man/translate/figs-metaphor and rc://en/ta/man/translate/figs-metonymy)

Disaster will not come upon you

"Nothing bad will happen to you"