Who said "I've learned that patience is harder than running fast."?

This quote is attributed to The Flash.

I've learned that patience is harder than running fast. - The Flash

"I've learned that patience is harder than running fast."

The Flash Patience

"My name is Barry Allen, and I am the fastest man alive."

"You can't save everyone. Sometimes you have to let people go."

"I'm fighting so that no one else has to suffer like I did."

"Life doesn't give you second chances. So I'm making my own."

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."