Paul Ehrlich

I have often been wrong, but I have never been in doubt.

The best way to predict the future is to create it.

Medicine is a science of uncertainty and an art of probability.

The more complicated the problem, the simpler the solution must be.

I am not afraid of death; I am afraid of not living.

The only true wisdom is in knowing you know nothing.

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

The mind is everything. What you think you become.

I have not failed. I've just found 10,000 ways that won't work.

The only limit to our realization of tomorrow will be our doubts of today.

It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.

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

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

What we achieve inwardly will change outer reality.

If you want to live a happy life, tie it to a goal, not to people or things.

The best revenge is massive success.

We must learn to live with the fact that we are part of a living planet, and that our future depends on the health of that planet.

The human mind is a product of evolution, and it is capable of both great good and great evil.

The greatest challenge facing humanity is to find a way to live sustainably on a finite planet.

Truth is not something that is given to us, but something that we must actively seek.