Revelation 16:15: Let all the sons of light

Let all the sons of light
Expect their Lord to come,
Unlook'd for, in the dead of night,
A sleeping world to doom:
Let all who Jesus know,
To meet their God prepare,
And pass their every hour below
In watching unto prayer.

Long as I watch, I keep
The blessing once bestow'd,
But forfeit, if again I sleep,
The richest grace of God;
Exposed and stripp'd of all
The' apostate's doom I feel,
And from perfection's summit fall
Into the deepest hell.