On that first Easter no one believed the explanation for an empty tomb was resurrection. No one, Thomas didn't even believe it a week later with the testimony of his 10 fellow disciples, the women and the men on the road to Emmaus who all claimed to have seen him. The first people who met the risen Lord didn't recognize him for two reasons, they had seen how he looked on Good Friday and they weren't prepared to see him alive. They didn't disbelieve, they weren't even considering the possibility. Resurrection changes everything. A pre-resurrection world has great but limited possibilities. If resurrection is a possibility then nothing can be considered impossible, there is no such thing as a lost cause.