Many years ago, a group of teenagers decided one Saturday evening that they were tired of the Church Youth Club and would go to the local Discotheque instead. So off they went, through the glass swing doors into the hall - except one lad.
Try as he might, he could not get through those doors.

It was as though there was an invisible barrier there preventing him from entering that Discotheque.

So, eventually he walked back home again and, peeping through the window, saw his mother on her knees pleading with God to prevent her son getting tangled up with worldly pleasures.

That young man went on to serve the Lord wholeheartedly and he has always been grateful for that intervention.