When you get back on the field and do things, any doubts you've developed leave. The more consistent you become, the fewer doubts you have.
“I started the nuclear medicine laboratory at UW Hospitals in 1959 and trained radiology residents in the field. It was 1965 before they found a trained MD (doctor) to take over my role.”
“Therefore, if God existed, only in one way could he serve human liberty - by ceasing to exist.”