One can have no more mastery over the environment, than one has over himself.

Just as courage imperils life, fear protects it.

...The world wouldn't be the world, without trouble.

Whoever despises the high wisdom of mathematics nourishes himself on delusion and will never still the sophistic sciences whose only product is an eternal uproar.

Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.

Many have made a trade of delusions and false miracles, deceiving the stupid multitudes.

I have wasted my hours.