The word of the LORD came to me: “Son of man, prophesy against the prophets of Israel, who are prophesying, and say to those who prophesy from their own hearts: ‘Hear the word of the LORD!’ Thus says the Lord GOD, Woe to the foolish prophets who follow their own spirit, and have seen nothing! Your prophets have been like jackals among ruins, O Israel. You have not gone up into the breaches, or built up a wall for the house of Israel, that it might stand in battle in the day of the LORD. They have seen false visions and lying divinations. They say, ‘Declares the LORD,’ when the LORD has not sent them, and yet they expect him to fulfill their word. Have you not seen a false vision and uttered a lying divination, whenever you have said, ‘Declares the LORD,’ although I have not spoken?” Ezekiel 13:1–7, ESV
A false prophet is one who claims to teach the truth from God and His Word, but who actually teaches from the counsel of his or her own heart. God is forever unchanging. He is immutable. His ways never change. His standards never change. At the time of Ezekiel, the kingdom of Judah had become consumed with idolatry. The people mixed Temple worship of YHWH with the worst forms of idol worship. They had taken on the culture and religion of the nations around them. Their culture had become pluralized. They were no longer a separate and unique people from the rest of the nations. The mechanism in people that powers this is compromise. The standard for God’s people has always been to be eternally focused with God in control. Compromise always moves God’s people to make decisions that are temporally focused, but, on the other hand, obedience to God is always counter to the demands of culture and the temporal.