Fear is the greatest obstacle ...

Fear is the greatest obstacle to learning. But fear is your best friend. Fear is like fire. If you learn to control it, you let it work for you. If you don’t learn to control it, it’ll destroy you and everything around you. Like a snowball on a hill, you can pick it up and throw it or do anything you want with it before it starts rolling down, but once it rolls down and gets so big, it’ll crush you to death. So one must never allow fear to develop and build up without having control over it, because if you don’t you won’t be able to achieve your objective or save your life.
Fear is the greatest obstacle to learning. But fear is your best friend. Fear is like fire. If you learn to control it, you let it work for you. If you don’t learn to control it, it’ll destroy you and everything around you. Like a snowball on a hill, you can pick it up and throw it or do anything you want with it before it starts rolling down, but once it rolls down and gets so big, it’ll crush you to death. So one must never allow fear to develop and build up without having control over it, because if you don’t you won’t be able to achieve your objective or save your life.

Quotes from the same author

“Don’t be surprised if I behave like a savage. I am a savage.”
Every great general and warrior from the beginning of time was high.
Lennox Lewis, I'm coming for you man. My style is impetuous. My defense is impregnable, and I'm just ferocious. I want your heart. I want to eat his children. Praise be to Allah!
I'm not Mother Teresa, but I'm not Charles Manson, either.
I never saw my mother happy with me and proud of me for doing something: She only knew me as being a wild kid running the streets, coming home with new clothes that she knew I didn't pay for. I never got a chance to talk to her or know about her. Professionally, it has no effect, but it's crushing emotionally and personally.