Alexander Fleming

The greatest discovery of all time was the discovery of the method of discovery.

The more I see, the more I am convinced that the world is full of wonders.

Science is not a game, it is a serious business.

The future of mankind is in the hands of science.

We must not forget that the bacteria are living organisms, and they have their own ways of defending themselves.

The scientist is not a person who gives the right answers, he's one who asks the right questions.

There are many men who can make a discovery, but few who can make use of it.

The world is full of possibilities, if only we are open to them.

The most important thing is not to stop questioning. Curiosity has its own reason for existence.

The true sign of intelligence is not knowledge but imagination.

Life is a series of natural and spontaneous changes. Don't resist them; that only creates sorrow. Let reality be reality. Let things flow naturally forward in whatever way they like.

The important thing is not to win, but to take part; the essential thing is not to have conquered but to have fought well.

We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

The universe is not required to be in perfect harmony with human ambition.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and all science.

Look deep into nature, and then you will understand everything better.

The aim of science is not to open the door to infinite wisdom, but to set a limit to infinite error.

The human mind is not a vessel to be filled, but a fire to be kindled.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

The only source of knowledge is experience.