“Family is the most important thing in the world.”
Princess Diana: 10 most inspiring quotes from the 'people's princess', Hello Magazine Daily News, (1 July 2015) http://us.hellomagazine.com/royalty/1201411051084/princess-diana-s-10-most-inspiring-quotes/
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Diana, Princess of Wales 22
First wife of Charles, Prince of Wales 1961–1997Related quotes
“What's the most important thing in the world? Walking the walk.”
What Would Jack Do?
Keynote speech at Christian Management Association conference in Denver, Colorado (March 2006)

Variant: That is the true experience of freedom: having the most important thing in the world without owning it.
Source: Eleven Minutes (2003), p. 97.
Context: In love, no one can harm anyone else; we are each of us responsible for our own feelings and cannot blame someone else for what we feel. It hurt when I lost each of the various men I fell in love with. Now, though, I am convinced that no one loses anyone, because no one owns anyone. That is the true experience of freedom: having the most important thing in the world without owning it.

De Abaitua interview (1998)
Context: A god is the idea of a god. The idea of a god is a god. The idea of Glycon is Glycon, if I can enhance that idea with an anaconda and a speaking tube, fair enough. I am unlikely to start believing that this glove puppet created the universe. It’s a fiction, all gods are fiction. It’s just that I happen to think that fiction’s real. Or that it has its own reality, that is just as valid as ours. I happen to believe that most of the important things in the material world start out as fiction. That everything around us was once fiction – before there was the table there was the idea of a table, and the idea of a table before tables was fiction. This is the most important world, the world of fictional things. That’s the world where all this starts.
As quoted in Jet Li Interview Transcript https://edition.cnn.com/2003/WORLD/asiapcf/01/29/talkasia.li.script/ in CNN (January 29, 2003)
Source: Natural Right and History (1953), p. 36

“The thing that's important for me is to remember what's the most important thing.”