John 14 is a continuation of John 13 where Jesus is having a very intimate conversation with the eleven disciples that are left (Judas has left to get his silver). He tells them, "Don't let your hearts be troubled...." He knew they were freaking out because he had told them one of them would betray him and he also told them he was leaving them for a bit. We can all use the comforting words Jesus gave them, "Trust in God and Trust in me."