Confidence has many meanings.
We can also take someone into confidence, which denotes a great deal of trust. The word for confidence is also translated often in the Bible as boldness. With Christ by our side, we boldly set forth to do his work, and we are confident that we can do anything that is within his will. Our ultimate confidence comes from trusting that God's Word is true. If we are assured of that, then we know all the blessings that await us in heaven, and we can endure any trials we face here on earth.