The Greek word that St. Luke  used in Acts 12:10 was "automatay" (of itself, its own accord).
Thus, the English word "automatic" might have been derived from that Greek word. 
Hence, it can be said tha the Iron Gate opened automatically for them. 
Why did the Iron Gate open automatically for Peter and the angel? 
The saints were still praying fervently for Peter.   

So, the transference of the spiritual weapon of
prayer was directed to open the Iron Gate. 
What gate is hindering you from achieving your divine destiny?
The solution is still prayer.

PRAYER OPENS GATES AUTOMATICALLY

GH₵40.00Price