Reality is an internal impression of the external world.

The drive for progress doesn't wait for the external world to say "It's time to change."

— James C. Collins

Ageing is very rare. We only see it in humans and laboratory animals and in zoo animals and in our pets. Basically, organisms that…

— S. Jay Olshansky

“Forms have changed through the centuries in obedience to the external world to which all forms belong.”

— Idries Shah

You have, like the external world, your own phenomena inside.

— Saul Bellow

Physiology is concerned with all those phenomena of life that present them selves to us in sense perception as bodily processes, and accordingly form…

— Wilhelm Wundt

There is nothing outside of us that is not at the same time in us, and as the external world has its colors the…

— Johann Wolfgang von Goethe

Each atom is trying to fly off from its centre. In the internal world, each thought is trying to go beyond control. Again each…

— Swami Vivekananda

“On first looking upon the external world, man pictured it to himself as a sort of confused republic, where rival forces made war upon…

— Anonymous

It will remain remarkable, in whatever way our future concepts may develop, that the very study of the external world led to the scientific…

— Alain Aspect

In other words, knowledge of the external world begins with an immediate utilisation of things, whereas knowledge of self is stopped by this purely…

— Jean Piaget

No one can help us to achieve the intimate isolation by which we find our secret worlds, so mysterious, rich and full. If others…

— Maria Montessori

“When it is imperative to make a vivid offering towards life then a simulated introspection for all possible dimensions may be endured to establish…

— Amit Gupta

As science went further and further into the external world, they ended up inside the atom where to their surprise they saw consciousness staring…

— Ravi Gomatam

“What is experienced from within cannot be categorized in concepts that have been developed for the external world of the senses.”

— Wilhelm Dilthey

The biggest (and hardest) lesson I've learned in life is that the external world is just a reflection of the world within.

— Tony Hsieh