Treasury of Scripture Knowledge
And He came [back] again and found them asleep, because they had not been able to keep their eyes open.
Now when the [bride and] groom were late [in arriving], the bridesmaids all got drowsy and fell asleep.
And when He came back and found His disciples sleeping He said to Peter, "Simon, are you sleeping? Could you not stay alert [in prayer] for one hour?
Now Peter and those with him [i.e., James and John] had been very sleepy, but became wide awake when they saw the splendor of Jesus and the two men standing with Him.
And when He got up from praying He went to His disciples and found them asleep, exhausted from grief.
Peter replied to Him, "Even if I have to die with you, still I will not deny [knowing] you." And all [the rest of] the disciples said the same thing.
But he denied [it] in front of all of them, saying, "I do not know what you are talking about."
"You should pay attention; be alert and pray, for you do not know when the time will come [i.e., for the Lord to return].
1 Corinthians 10:12
So, the person who thinks he is standing firm [in the faith] should pay attention [to his life], so that he does not fall [away from God].