In the philosophy of Jeet Kune Do, it does not matter how big and strong the fighter is, what matters is how skilled you are in the fighting style you train in. And it does not matter what fighting style you do, but what matters is how well you've absorbed your learning and training. For example: you could be a black belt in Karate for all I care, but a boxer can beat you if you are full of yourself and are not wise enough to let nature take its course in the fight.
"Be like water making its way through cracks. Do not be assertive, but adjust to the object, and you shall find a way around or through it. If nothing within you stays rigid, outward things will disclose themselves.
Empty your mind, be formless. Shapeless, like water. If you put water into a cup, it becomes the cup. You put water into a bottle and it becomes the bottle. You put it in a teapot, it becomes the teapot. Now, water can flow or it can crash. Be water, my friend."-Bruce Lee
"I fear not the man who has practiced 10,000 kicks once. But I fear the man who has practiced one kick 10,000 times."-Bruce Lee
"Quick temper will make a fool of you soon enough"-Bruce Lee