Scripture: Hebrews 5:11-6:6, Scripture calls on us to mature faith for our own benefit. We hone our powers of discernment by constant practice to distinguish between good and evil. We are to receive well the teaching of solid food and be carried along in learning. For those who fall away from the faith, there is no new start apart from what they have already received in baptism. These are people who once believed and were enlightened and understood the faith fully and now rejected it. Restoration and repentance are extremely unlikely (i.e. impossible for the Church) but "with God all things are possible". Regardless, rebaptism is not to be done.