I think this means that although all knees will bow and every tongue will confess, there does come a point in which it is too late to repent...because we know not all people will be saved. I think judgement day will definitely be too late. Also, I don't think there is any chance for repentance after death. One example can be found in the parable of the rich man and Lazarus. The rich man seemed truly sorrowful, but was still in hell and torture anyhow. He even asked if he could send Lazarus to warn his brothers. There was no repentance for him and he seemed to know it was too late for him, but wanted someone to warn his brothers while they were still alive. Once again this is just some of my thoughts on it.