He was alone - no eye-witnesses.  Have to trust that he was telling the truth.

Matthew 18:16;  Matthew 24:23-27;  John 8:17;  2 Corinthians 13:1

 

The First Vision

Deuteronomy 13:1-5;  Jeremiah 14:14;  Ezekiel 13:3, 6-8;  Matthew 4:8-9

 

Either the vision of a 14 year old boy was a real physical event or he simply dreamed of having an experience while praying in the woods - an invention of a highly imaginative mind or a demonic deception.

He never shared the experience with family or associates.  Not publicly known until 22 years after it supposedly happened.

Matthew 10:26-27;  Ephesians 5:11-13