ἐάν τις θέλῃ τὸ θέλημα αὐτοῦ ποιεῖν, γνώσεται περὶ τῆς διδαχῆς, πότερον ἐκ τοῦ Θεοῦ ἐστιν ἢ ἐγὼ ἀπ᾽ ἐμαυτοῦ λαλῶ.

1. ἐάν
   if
2. τις
   someone
   who
3. θέλῃ
   wishes
4. τὸ
   the
5. θέλημα
   will
6. αὐτοῦ
   his
7. ποιεῖν
   to do
8.  
   ,
    
9. γνώσεται
   will know
10. περὶ
    about
    concerning
11. τῆς
    of the
    the
12. διδαχῆς
    teaching
13.  
    ,
     
14. πότερον
    whether
15. ἐκ
    from
    out of
16. τοῦ
    of the
    the
17. Θεοῦ
    God
18. ἐστιν
    is
19. ἢ
    the
    or
20. ἐγὼ
    i
21. ἀπ᾽
    from
22. ἐμαυτοῦ
    myself
    of myself
23. λαλῶ
    i speak
    speak
24.  
    .
     

If someone wants to do his will, he will know about the teaching, whether it is from God or whether I speak from myself.