13 But we do not want you to be uninformed, brethren, about those who are asleep, so that you will not grieve as do the rest who have no hope. 14 For if we believe that Jesus died and rose again, even so God will bring with Him those who have fallen asleep in Jesus. 1 Thessalonians 4:13-18 (NASB) Read verses 15-18 on the site.
Unbelief is a deceitful thing. Those who are in unbelief do not actually comprehend that they are. This is due to their spiritual blindness and hardness of heart. Christians are not immune form being in unbelief, but Spirit-filled believers, by definition, are not because they are tender of heart and have had the scales of spiritual blindness removed from their hearts….
They believe God and their new nature takes precedence over their flesh. On the other hand, believers who are enslaved to their flesh may very well resent the truth being proclaimed to them because they see themselves with muted vision. Since their flesh controls them, they have no spiritual discernment. They resent the truth because their muted vision of themselves causes them to see themselves from the viewpoint of the Natural Man.