From After Earth:
"Fear is not real, it is a product of thoughts you create. Do not misunderstand me; danger is very real. But fear is a choice."
From The Green Lantern:
"Fear is the enemy of will. Will is what makes you take action. Fear is what stops you and makes you weak. You must ignore your fear. When you're afraid, you can't act."
"Fear is a sickness. It will crawl into the soul of anyone who engages it."
From Star Wars Episode 1 - The Phantom Menace: (This is perhaps one of the most well-known movie quotes about fear.)
"Fear is the path to the Dark Side. Fear leads to anger. Anger leads to hate. Hate leads to suffering."
Movie quote source: