Who said "I choose to focus on what I can control, not what I can't."?

This quote is attributed to Rex.

I choose to focus on what I can control, not what I can't. - Rex

"I choose to focus on what I can control, not what I can't."

Rex Wisdom

"I'm a dinosaur! RAWR!"

"Oh no, oh no, oh no, oh no, oh no!"

"I can't take the pressure!"

"Everything's gonna be okay, right?"

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."