Alexander Fleming

The true scientist is a man of faith. He believes in the order and harmony of nature.

Science without religion is lame, religion without science is blind.

The most beautiful experience we can have is the mysterious.

The important thing is to never stop questioning.

The human race has one really effective weapon, and that is laughter.

Imagination is more important than knowledge.

The only way to discover the limits of the possible is to go beyond them into the impossible.

The greatest glory in living lies not in never falling, but in rising every time we fall.

Life is what happens when you're busy making other plans.

The unexamined life is not worth living.

To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.

The mind is everything. What you think you become.

Happiness is not something ready-made. It comes from your own actions.

The only true wisdom is in knowing you know nothing.

Everything has beauty, but not everyone sees it.

The journey of a thousand miles begins with a single step.

What we achieve inwardly will change outer reality.

It is not difficult to make microbes resistant to penicillin in the laboratory by exposing them to concentrations not sufficient to kill them, and the same thing has occasionally happened in the patient.

The thoughtless person playing with penicillin treatment is morally responsible for the death of the man who succumbs to penicillin-resistant infection.

There are thousands of different molds, and some of them produce substances that kill bacteria. We just happened to find one that was useful.