Soul becomes spirit?

Even after years of listening to extracts from the Bible, everyday during Mass and prayers, some passages still catch my attention.  Perhaps the version I hear has something to do with it. Or maybe it is the reading I'm engaged in/with currently as part of my research.  Or maybe just that I'm hearing that section of the Bible for the first time (possible!!).  Anyway, was surprised to read the following this morning.

Whatever you sow in the ground has to die before it is given new life and the thing that you sow is not what is going to come... It is the same with the resurrection of the dead: the thing that is sown is perishable but what is raised is imperishable.... when it is sown it embodies the soul, when it is raised it embodies the spirit. If the soul has its own embodiment, so does the spirit have its own embodiment. 

Now those two lines are new to me.  The Bible making the distinction between soul and spirit?  And after death the soul is transformed into the spirit?  I remember I've thought about the embodiment after resurrection part before, but not this soul-spirit distinction and transformation.

Words do have the strange ability to confuse and confound!  God is no better!