γρηγορεῖτε οὖν, ὅτι οὐκ οἴδατε ποίᾳ ὥρᾳ ὁ Κύριος ὑμῶν ἔρχεται.

1. γρηγορεῖτε
   be watchful
   keep watch, watch
2. οὖν
   therefore
3.  
   ,
    
4. ὅτι
   that
   because
5. οὐκ
   not
6. οἴδατε
   you know
7. ποίᾳ
   what
   what kind
8. ὥρᾳ
   hour
9. ὁ
   the
10. Κύριος
    Lord
11. ὑμῶν
    your
12. ἔρχεται
    comes
13.  
    .
     

be watchful therefore, because you do not know what hour your Lord comes.