Who said "Self-doubt is the enemy before any outside force."?

This quote is attributed to Black Lightning.

Self-doubt is the enemy before any outside force. - Black Lightning

"Self-doubt is the enemy before any outside force."

Black Lightning

"I'm not a hero. I'm just a man trying to protect my family and my community."

"Power without purpose is just destruction."

"We all have choices. Some are harder than others."

"Fear is a tool. You can let it control you or use it to motivate you."