Who said "You're capable of far more than you realize."?

You're capable of far more than you realize. - Q

"You're capable of far more than you realize."

"I am Q. I exist outside your normal space-time continuum."

"You humans are so fragile, yet so determined to survive."

"The trial never ends, it simply evolves."

"Your species shows promise, though it is frequently buried under remarkable stupidity."