Robert Koch

If we want to be successful, we must not only be able to observe, but also to think.

The true value of a man is not in what he has, but in what he is.

Science is the only way to truth.

The most important thing in life is to learn how to give out love, and to let it come in.

The greatest discovery of all time is that a person can change his future by merely changing his attitude.

The only way to do great work is to love what you do.

Life is not a problem to be solved, but a reality to be experienced.

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.

The only true wisdom is in knowing you know nothing.

Do not go where the path may lead, go instead where there is no path and leave a trail.

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

What we achieve inwardly will change outer reality.

The quieter you become, the more you can hear.

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

The only constant in life is change.

We are what we repeatedly do. Excellence, then, is not an act, but a habit.

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

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