οὐ γὰρ συνῆκαν ἐπὶ τοῖς ἄρτοις, ἀλλ᾽ ἦν αὐτῶν ἡ καρδία πεπωρωμένη.

1. οὐ
   not
2. γὰρ
   for
3. συνῆκαν
   they understood
   understood
4. ἐπὶ
   upon
5. τοῖς
   the
   to the
6. ἄρτοις
   breads
   bread, loaves
7.  
   ,
    
8. ἀλλ᾽
   but
9. ἦν
   was
10. αὐτῶν
    their
    of them
11. ἡ
    the
    or
12. καρδία
    heart
13. πεπωρωμένη
    hardened
14.  
    .
     

For they did not understand about the loaves, but their heart was hardened.