One sometimes finds what one is not looking for.

(The discovery of penicillin) was a triumph of accident, a fortunate occurrence which happened while I was working on a purely academic bacteriological problem.

Penicillin cures, but wine makes people happy.

It has been demonstrated that a species of penicillium produces in culture a very powerful antibacterial substance which affects different bacteria in different degrees. Generally speaking it may be said that the least sensitive bacteria are the Gram-negative bacilli, and the most susceptible are the pyogenic cocci ... In addition to its possible use in the treatment of bacterial infections penicillin is certainly useful... for its power of inhibiting unwanted microbes in bacterial cultures so that penicillin insensitive bacteria can readily be isolated.

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.

Penicillin sat on a shelf for ten years while I was called a quack.