JERUSALEM — A new book by an Israeli watchdog group catalogs dozens of examples of messages broadcast by the Palestinian Authority for its domestic audience that would seem at odds with the pursuit of peace and a two-state solution.

Instead, the authors say, their findings show a pattern of non-recognition of Israel’s right to exist, demonization of Israel and promotion of violence.

Of course, this is nothing new. For years, many Israeli and Palestinian analysts have said that what Palestinian leaders tell their own people in their own language — as opposed to English-language statements tailored to opinion in the rest of the world — is the truest reflection of their actual beliefs. This has had the effect of further entrenching the sides to the conflict and undermining confidence that it can ever be resolved.

“There is no doubt in my mind that in the mainstream of the Palestinian national movement, Israel is not considered legitimate,” said Shlomo Avineri, an Israeli professor of political science at the Hebrew University of Jerusalem, reflecting a widespread sense of disillusionment. “This is the inner truth of the Palestinians,” he said. “They really mean it. It is not what they say on CNN, but it is what they teach their children.”