We push ourselves to the unexpected. We are trying to solve the unsolvable mysteries of the universe, science, and technology. Is there any room for doubt?
Why do we doubt ourselves? Is it because we are less confident, is it because we are scared to fail?
Is doubt even an option for researchers, builders, scientists, or medical practitioners?
When all eyes of the civilization are on you, doubt will hinder innovation and progress. It will fail the entire team and delay in producing the desired result be it a medicine or technology.