Who said "I cannot afford to make careless mistakes in my work."?

This quote is attributed to Dexter.

I cannot afford to make careless mistakes in my work. - Dexter

"I cannot afford to make careless mistakes in my work."

Dexter Work

"What does this button do?"

"I must focus on my work."

"Science rules!"

"Dee Dee, get out of my laboratory!"

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."