let me point out something, it was not a matter of returning to dig a hole to put his dead father into. his father had not yet died and had no idea when he would die.
thats not why jesus said you must be born again. look at it this way ,born means to start . to be born again means to start over . to learn the new things needed to live on into the future . things are going to be different when the kingdom takes over. yes you need to be born again
lets not for get ,Jesus speaking
John 14:28
You heard that I said to you, ‘I am going away and I am coming back to you.’ If you loved me, you would rejoice that I am going to the Father, for the Father is greater than I am.
it would be best if you did not confuse spirit , like the angels are spirit jesus is now spirit . with the life force of animals and mankind . two different things that use the same word. the spirit of the flesh is biochemical electricity. there is also teem spirit an sprites (alcohol)