Explaining a song

Hello,

I love the song "Immortality" / by Bee Gees and Celine Dion. But could you help me please?

1/ Please, tell me about the real meaning of the song

2/ And please, make clear this verse of the song (I do not understand it very well):

Fulfill your destiny
It's there within the child
My storm will never end
My fate is on the wind
The king of hearts, the joker's wild

THANK YOU!