Heavier-than-air flying machines are impossible.
The world is the totality of facts, not of things.
Nothing is so difficult as not deceiving oneself.
Superstition is the belief in the causal nexus.
The limits of your language are the limits of your world.
I might have some Danish lessons sometimes.
A proof tells us where to concentrate our doubts.
Passion is the drunkenness of the mind.
Natures' curriculum cannot be changed.
It takes patience to appreciate domestic bliss; volatile spirits prefer unhappiness.
I hope our hopes and aspirations are bigger than setting records.
How easy to be amiable in the midst of happiness and success.
Logic will get you from A to B. Imagination will take you everywhere.
Mother Nature is not sweet.
Before God we are all equally wise - and equally foolish.
The origin of life is one of the great outstanding mysteries of science.
It's always good news when you're closer to the truth.
Love is friendship set on fire.
Faith is not belief without proof, but trust without reservation.
I shall never believe that God plays dice with the world.
Define yourself radically as one beloved by God.