United Kingdom, Feb. 21 -- Justin Bieber has declared it's "time to grow up".

The 30-year-old pop star - who is married to model Hailey Bieber, 28, and has six-month-old son Jack - shared a cryptic post on his Instagram page in which he admitted he is "not good" at following rules but he's determined to embrace a "life of love" as he follows his Christian faith.

Justin wrote: "It's time to grow up. Changing is about letting go! Not trying harder! Are you tired of trying to follow all of the rules in hopes to get the results you crave? I've found love to be more powerful than rules."

He added: "I tried to follow the rules. I'm not good at it. But u don't need to follow rules to enter into a life of love. U just receive so enter love liv...