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