A strong body is a good asset. A strong mind is a very good asset.
If you are not comortable to deal with an opponent 50 lbs heavier than you, there is something wrong with your Jiu Jitsu.
Our fears don't stop death, they stop life.
When I am fighting I am keeping my mind empty for any expectations. I am waiting for something unique, completely new.
I am a shark, the ground is my ocean, and most people can't even swim.
If you believe, then you have already taken the first step towards your achievement.