Fear is the only true enemy of progress. - Thor (The Avengers)

"Fear is the only true enemy of progress."

Thor (The Avengers) Fear

More from Thor (The Avengers)

"I am Thor, god of thunder!"

"You lack the strength to wield such power."

"I have nothing but respect for you, and your work."

"There are no men like me."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."