The second resurrection tells me that God will bring them back from the dead.
The Bible tells us it is appointed to man only to live once you know.
Once you are Dead that's it the end of your body's life and then comes the Heavenly so called body in Heaven = a Spiritual Soul so to speak.
People who are born again are Spiritually in touch with the Lord Jesus, they have made that level, but people their are Baptised that have some awareness of such but have not reached that point of the born again.
By the Narrow gate not Wide, because most are at the wide gate = the worldly water baptised.
At the end of the day one must be born again and that's all that matters to cut it, because it means that one knows totally in Christ Jesus and no add on too type of rubbish cuts it, that many are mislead with.