Change from the inside
"Grace to you and peace from God our Father and the Lord Jesus Christ. ...
In [Jesus Christ] you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit ..."
~ Ephesians 1.2,13 ESV
The Holy Spirit works in me, because I believe in God the Father and Jesus Christ. This is a clear difference between Jesus-believers and non-believers.
And the impact is visible: changed life. Change that is not externally motivated due to incentive nor fear. But change from the inside out through the workings of the Holy Spirit. I cannot do it, except by the grace of the Holy Spirit.
See: Change and learning