Jeremiah 7:27

Therefore thou shalt speak all these words unto them, viz. revive upon them all that thou hast been speaking to them from me these forty years and upwards. Whereby God shows that there is nothing wanting on his part; for notwithstanding all their perverseness, yet he still warns them by his prophet, which will leave them the more inexcusable, Ezekiel 2:5,7. But they will not hearken to thee: this must needs be a great trial to the prophet, that he is assured that he shall speak to them in vain. But this God acquaints him with beforehand, partly for Jeremiah's sake, that he should not be discouraged, but the more emboldened, though he saw no success, Ezekiel 2:7; and partly for the people's sake, that being foretold of their obstinacy, they might bethink themselves and repent, if yet there might be hope, Lamentations 3:29. Thou shalt also call unto them, but they will not answer thee: this shows their further refractoriness, that were not only deaf to God's message by his prophet, but though he cried loud, followed one exhortation with another, yet they would make no return unto it.