Who said "I have transcended the doubts that plague lesser minds."?

This quote is attributed to Dexter.

I have transcended the doubts that plague lesser minds. - Dexter

"I have transcended the doubts that plague lesser minds."

Dexter Courage

"What does this button do?"

"I must focus on my work."

"Science rules!"

"Dee Dee, get out of my laboratory!"

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."