Revelation 3:2-3

2Wake up, and strengthen and reaffirm what remains [of your faithful commitment to Me], which is about to die; for I have not found [any of] your deeds completed in the sight of My God or meeting His requirements.

3So remember and take to heart the lessons you have received and heard. Keep and obey them, and repent [change your sinful way of thinking, and demonstrate your repentance with new behavior that proves a conscious decision to turn away from sin]. So then, if you do not wake up, I will come like a thief, and you will not know at what hour I will come to you.