What Is the Hardest Teaching?

In the old testament, cannibalism was a sign that god had taken his hand off the nation. But if jesus listen, it's talking about, life is in the blood, but drink my blood. That means that life is in him. And because they didn't understand it, they began pushing back from jesus christ. Because he came up against them, having to push through their struggle with what he was saying In order to continue to be a disciple.