I'll believe it when I see you...
No, you won't.
That would mean you world have to admit you were wrong.
That's not likely to happen for most people.
For those who do want to grow, however, you need to change the phrase. Start saying you'll see it when you believe it.
You need to believe it before you'll look for evidence to see it. Change the belief first, then seek the evidence.
No excuses!
Kevin Brewer
Rise Again From The Struggle