You want to make sure that whatever you believe concerning being spiritually saved, that the foundation of it cannot be shakened. You have to be assured above all doubt that your walk with the Lord is approved of and accepted by God, because if not then you're simply wasting your time in all that you are doing. There appears to be only one shot at getting it right concerning serving God and that one shot is the one life that we have in this natural world, therefore you want to investigate your spiritual quest to the fullest extent.