"I am often asked if I foresaw the impact of penicillin. My honest answer is no."

"The world is full of interesting things. You just have to look for them."

"I am very grateful for the recognition I have received, but the real credit belongs to the mould."

"The early days of penicillin were full of disappointments, but we never gave up."

"The greatest discovery of my life was not penicillin, but the fact that I was wrong about something."