Our Savior is not willing that any should perish, but that all should have eternal life. And this passage is the end of it all. Finally he will say it as plainly and simply as he can, and that's it. He's done his best. These are his last public words until the resurrection.
Last words are important words.
Notice what he doesn't say. That's how we will be judged. So simple to understand. So hard to live by. Remember the road to Emmaus, how after the resurrection the disciples seldom recognized who he was until they looked closer.