Why do we think the rapture is going to happen soon?
The expectation of an imminent rapture rests on the observation that the Lord is filling up the body, which signals that it is getting awfully close to the midnight hour. Because that filling is underway, it is believed the rapture will take place soon.
Les explains that the sense of the rapture's nearness comes from the Lord filling up the body, which he says is getting awfully close to the midnight hour. On that basis, he states that the rapture will take place. The surrounding context also urges believers not to be careless but to live to glorify God, though the timing point itself rests on the filling of the body.