Romans 1:16 says For I am not ashamed of the gospel of Christ; for it is the POWER of God unto everyone that believes. First unto the Jew and then the Greek. The power you search for is found in the simple message of the gospel. This is the power that is able to turn lives around, the power that is able to raise the dead, the power that is able to cast out demons. All you need to do is believe with unwavering doubt.