Who said "I never knew I could do half the things I can do now."?

This quote is attributed to Ned Leeds.

I never knew I could do half the things I can do now. - Ned Leeds

"I never knew I could do half the things I can do now."

Ned Leeds Perseverance

"It's just the web-shooters, Mr. Stark. I designed them myself."

"I can't tell anyone about this. Not even my best friend."

"That's so cool! Oh man, this is insane!"

"I'm really interested in science and engineering."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."