Acts 4:13 says, “Now when they saw the boldness of Peter and John, and perceived that they were uneducated and untrained men, they marveled.  And they realized that they had been with Jesus.”

What set Peter and John apart was the fact that they had been with Jesus.  Could you use some high-octane boldness?  Could you use some courage?  Are you being criticized, mocked, persecuted?  If so, imitate the disciples.  Linger long and often in the presence of Christ.  Meditate on His grace.  Ponder His love.  Memorize His words.  Gaze into His face.  Talk to Him.  Courage comes as we live with Jesus.