Remember, then, what you received and heard; obey it, and repent. But if you (grēgorēsēs | γρηγορήσῃς | aor act subj 2 sg) do (grēgorēsēs | γρηγορήσῃς | aor act subj 2 sg) not wake up (grēgorēsēs | γρηγορήσῃς | aor act subj 2 sg), I will come like a thief, and you will not know at what hour I will come against you.
Reference
Revelation 3:3
Sequence
21