Zitat des Tages von Leonardo da Vinci:
In order to arrive at knowledge of the motions of birds in the air, it is first necessary to acquire knowledge of the winds, which we will prove by the motions of water in itself, and this knowledge will be a step enabling us to arrive at the knowledge of beings that fly between the air and the wind.
Life well spent is long.
I have always felt it is my destiny to build a machine that would allow man to fly.
There are three classes of people: those who see, those who see when they are shown, those who do not see.
He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.
As a well-spent day brings happy sleep, so a life well spent brings happy death.
Who sows virtue reaps honor.
You can have no dominion greater or less than that over yourself.
It seems that it had been destined before that I should occupy myself so thoroughly with the vulture, for it comes to my mind as a very early memory, when I was still in the cradle, a vulture came down to me, he opened my mouth with his tail and struck me a few times with his tail against my lips.
Common Sense is that which judges the things given to it by other senses.
Necessity is the mistress and guide of nature. Necessity is the theme and inventress of nature, her curb and her eternal law.
You do ill if you praise, but worse if you censure, what you do not understand.
Time abides long enough for those who make use of it.
Why does the eye see a thing more clearly in dreams than the imagination when awake?
All our knowledge has its origins in our perceptions.
Learning never exhausts the mind.
Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
It's easier to resist at the beginning than at the end.
The poet ranks far below the painter in the representation of visible things, and far below the musician in that of invisible things.
The noblest pleasure is the joy of understanding.
The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.
Just as food eaten without appetite is a tedious nourishment, so does study without zeal damage the memory by not assimilating what it absorbs.
I have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
Beyond a doubt truth bears the same relation to falsehood as light to darkness.
The Medici created and destroyed me.
As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.
How many emperors and how many princes have lived and died and no record of them remains, and they only sought to gain dominions and riches in order that their fame might be ever-lasting.
Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
I have wasted my hours.
The beginnings and ends of shadow lie between the light and darkness and may be infinitely diminished and infinitely increased. Shadow is the means by which bodies display their form. The forms of bodies could not be understood in detail but for shadow.
Nothing strengthens authority so much as silence.
I love those who can smile in trouble, who can gather strength from distress, and grow brave by reflection. 'Tis the business of little minds to shrink, but they whose heart is firm, and whose conscience approves their conduct, will pursue their principles unto death.
Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.
The human bird shall take his first flight, filling the world with amazement, all writings with his fame, and bringing eternal glory to the nest whence he sprang.
The truth of things is the chief nutriment of superior intellects.