In the biographical gospel accounts we find that some words and actions are attributed to Jesus when he was said to be alone. In other words, how did a gospel author know what Jesus said or did when alone? For instance, in Mark 14 Jesus prays in the Garden of Gethsemane where no eyewitnesses were present, yet his prayer is recorded in Mark’s account. This provides an enigma.
1. Due to Inspiration.
First off, if we are to combat Christianity on its own turf then we need to embrace its alleged truth claims to do so, and one of those is that of God’s spirit, the Holy Spirit. It is entirely possible that if the Christian God exists that he could convey his message, in whatever form he would prefer, to the author of the Gospels who were writing under inspiration. In John 14:26 it is alleged that the spirit will teach in his name “and will remind you of everything I have said to.” It is also affirmed by the author of 2 Timothy 3:16 that the scripture they are writing is “God breathed,” hence an indication of interaction with God’s spirit. And when Paul wrote to those in Galatia he told them that his teachings came to him “through revelation of Jesus Christ” (Galatians 1:12), as well as “revealed by the Spirit to His holy apostles and prophets” (Ephesians 3:5). This would be the supernatural answer to the question.
2. Due to Jesus’ Own Explanations.
A second possible explanation would be that Jesus himself would have let the disciples know what he had done in his time alone. It is possible that Jesus could have relayed the events that occurred since he spent much time with them. This could have been what happened in John 4 where Jesus speaks to a woman at a well. No-one else was around to witness this but somehow we seem to have Jesus’ conversation quoted in full. It is probable that Jesus relayed to the disciples the events that took place.
3. Jesus’ Post-Mortem Appearances.
Thirdly, assuming the historicity of his supernatural post-mortem appearances, Jesus also appeared to the disciples over a period of 40 days. In that time he was “speaking to them about the kingdom of God” (Acts 1:3), and if he so wanted to he could have filled the disciples in with the details about what happened to him when they weren’t there to see it. So, in finishing there are, essentially, four possibilities:
1 – That the Holy Spirit revealed to the disciples what Jesus did when he was alone.
2 – That Jesus himself told the disciples what he did when he was alone.
3 – That Jesus revealed what he did when he was alone during his 40-day appearance after his crucifixion (Acts 1:3).
4 – That the information was provided via the Holy Spirit, via Jesus during his Earthly ministry, and during the 40 days in which he appeared and spoke about the Kingdom of God.