A closer look at John 3:6

[jfrog]

Originally Posted by shag

Perhaps because he was simply only drawing the difference between physical birth(water) and spiritual birth(Spirit infilling). Not between physical birth, and water and spirit birth.
Especially if water baptism is said to be a burial, instead of said to be a birth (ROM. 6:4)

I think you may have just answered your own question.

Jesus said you must be born again.

As Romans describes, the old man must die to be reborn. Water baptism would then be the completion of the old man dying (his burial). Spirit baptism would then be beginning of the new man living.