We are totally genuine with God and ourselves at this point. We give everything for Him and nothing is too precious to hold back, for nothing can be more important that giving Him our lives. Nothing else can allow a man to enter the veil. Without it, High Priest cannot enter. Unless we give our all in salvation, we simply are not united to Him in covenant and are not saved.
Blood represents our very lives.
Only with blood could the High Priest enter. So Christianity is not simply joining a church or congregation. Unless we give Him that, we are lost and without hope. We must give him our wills, for it was Adam's independent will that threw all humankind into sin to begin with. If we fail to yield all to Him, we are simply not saved.