The Thief in the Night
Unexpectedness demands watchfulness.
Jesus compares his coming to a thief: preparedness matters because timing is not granted.
Scripture
42 Watch therefore, for you don't know in what hour your Lord comes.
43 But know this, that if the master of the house had known in what watch of the night the thief was coming, he would have watched, and would not have allowed his house to be broken into.
44 Therefore also be ready, for in an hour that you don't expect, the Son of Man will come.
39 But know this, that if the master of the house had known in what hour the thief was coming, he would have watched, and not allowed his house to be broken into.
40 Therefore be ready also, for the Son of Man is coming in an hour that you don't expect him."