Penicillin cures, but wine makes people happy.
The unprepared mind cannot see the outstretched hand of opportunity.
If penicillin can cure those that are ill, Spanish sherry can bring the dead back to life.
For the birth of something new, there has to be a happening. Newton saw an apple fall; James Watt watched a kettle boil; Roentgen fogged some photographic plates. And these people knew enough to translate ordinary happenings into something new.
One sometimes finds what one is not looking for.
Penicillin sat on a shelf for ten years while I was called a quack.