Robert Koch

The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

The only way to escape the corruptible effect of praise is to go on working.

Knowing yourself is the beginning of all wisdom.

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

Believe you can and you're halfway there.

The future belongs to those who believe in the beauty of their dreams.

It is during our darkest moments that we must focus to see the light.

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

We are all in the gutter, but some of us are looking at the stars.

The best revenge is massive success.

The only thing necessary for the triumph of evil is for good men to do nothing.

To live is the rarest thing in the world. Most people exist, that is all.

The true sign of intelligence is not knowledge but imagination.

The parasitic nature of tuberculosis has been proven beyond all doubt.

It is not the disease that is inherited, but the predisposition to it.

The discovery of the tubercle bacillus is the beginning of the end of tuberculosis.

The most important thing in medicine is to find the cause of the disease.

The existence of specific disease-causing microorganisms is no longer a matter of speculation, but a proven fact.

The idea that diseases arise spontaneously is a relic of a bygone era.

We must not rest until we have found the specific cause for every infectious disease.