What do we spend eternity in, this flesh body or something else? This is what I choose to believe.
1 Corinthians 15:44 It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
[We have two bodies, a natural one and a spiritual one. See 2 Corinthians 5:1-8; when we die we are present with the Lord. The spiritual body is what one spends eternity in, not their flesh/natural body. What does the word “raised” mean in 1 Corinthians 15:44? Resurrection (a transition from flesh to spirit) is what I think it means].
Ecclesiastes 12:6 Or ever the silver cord be loosed, or the golden bowl be broken, or the pitcher be broken at the fountain, or the wheel broken at the cistern.
[Ecclesiastes is written to the man under the sun, flesh man. This verse is saying when this flesh body dies for whatever the reason; see next verse].
Ecclesiastes 12:7 Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.
[Our spirit returns to God who gave it and our flesh bodies return to the earth, we are finished with them, they have fulfilled their purposes in God's plan; they go back to the dust/dirt/soil/earth they are made of].
James 2:26 For as the body without the spirit is dead, so faith without works is dead also.
[When we die, our flesh bodies are dead without a spirit. Our spirits go back to God who gave it; see Ecclesiastes 12:7 again].
Hebrews 9:27 And as it is appointed unto men once to die, but after this the judgment:
[When this flesh body dies, and it will, our spirits go where God is and await His judgment].
This is what I choose to believe:
There is no way these flesh bodies of ours will last for ever; they get sick sometimes and they age and die eventually, they are temporary only. We have a spiritual body; that is what is meant to last an eternity, not our flesh bodies. Our spirits/souls and spiritual bodies are with God upon death of the flesh; awaiting judgment (Hebrews 9:27). I have tried to connect the dots in my own mind; (let every man be fully persuaded in his own mind).
In any case, keep studying the entire Bible my friends.