γρηγορεῖτε οὖν, ὅτι οὐκ οἴδατε τὴν ἡμέραν οὐδὲ τὴν ὥραν ἐν ᾗ ὁ υἱὸς τοῦ ἀνθρώπου ἔρχεται.

1. γρηγορεῖτε
   be watchful
   keep watch, watch
2. οὖν
   therefore
3.  
   ,
    
4. ὅτι
   that
   because
5. οὐκ
   not
6. οἴδατε
   you know
7. τὴν
   the
8. ἡμέραν
   day
9. οὐδὲ
   nor
10. τὴν
    the
11. ὥραν
    hour
    season
12. ἐν
    in
13. ᾗ
    the
    or
14. ὁ
    the
15. υἱὸς
    son
16. τοῦ
    of the
    the
17. ἀνθρώπου
    of man
    man
18. ἔρχεται
    comes
19.  
    .
     

Be watchful therefore, because you do not know the day nor the hour in which the Son of Man comes.