The Word says that those who seek Him shall find Him, and that He rewards those who diligently seek Him, so there is no reason to not become born again except because of refusal to seek Him, and no reason that the born again cannot be integrally involved in His Kingdom plan by diligently seeking Him to “gain the mind of Christ.” Of course as long as we are in these bodies in this fallen world, the born again will still fall short, yet forgiven, pressing on to complete the work to be done before His return.