Doubt
When Jesus Christ rose from the dead, many people doubted that the person they were seeing was really Jesus; they didn't believe that he had really come back from the dead. Jesus told these people to believe and not doubt.

In the same way, Christians have to believe in Christ today even though he cannot be seen. Doubting is not sinful, but it can weaken us. Ask God to reveal himself to you through your doubts and questions, and then look for the answers! God instructs us to believe in him and his power. He says that when we have faith, we can accomplish great things.

God instructs his people to not doubt him, but to have faith.
Matthew 14:31; 21:21
John 20:24-27
James 1:5-8