"I do not have, nor do I believe I have seen, a vision capacious and convincing enough to propound as an organizing principle for the next phase in the law of our Constitution"

This quote by Laurence Tribe suggests that he does not have a clear vision of what the law of the Constitution ought to look like in the future. He thinks that the vision he has seen is not extensive or persuading enough to be utilized as an assisting principle for the next stage of the law. This implies that he is trying to find a more comprehensive and persuading vision that can be used to shape the future of the law. He is likely recommending that the current vision of the law is not sufficient and that a more extensive and persuading vision is needed to move forward. This quote highlights the value of having a clear and extensive vision for the future of the law in order to ensure that it is effective and simply.