Important message behind Aussie boxer's new children's book

World champion boxer Billy Dib is tough as nails - not only in the ring, but in mind and spirit. 

Cancer may have ended his boxing career, but the Australian fighter has found a new and rewarding purpose.

His new children's book, Boys Can Cry, has an important message.

"I really just want to inspire young children to see the greatness within themselves," he told A Current Affair.

Watch the full story in the video player above.