How Did Peter Move from Denial to Devotion?

Peter went from denying Jesus three times to boldly preaching Christ at Pentecost. How did that happen? How did Peter go from failure to faithfulness?

Sources
http://www.marvinmckenzie.org
https://marvinmckenzie.substack.com/
https://www.amazon.com/stores/Marvin-McKenzie/author/B005OZV81Q?
https://www.smashwords.com/profile/view/MarvinMcKenzie
https://medium.com/@booksbymarvinmckenzie
https://macz.creator-spring.com/
https://ko-fi.com/marvinmckenzie14276
https://www.youtube.com/@MarvinMcKenzie
https://www.youtube.com/@ApologeticsAdvocates
https://www.youtube.com/@MarvinMcKenziePreacher
https://www.youtube.com/@LegendsofLiberty