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Danh ngôn của Leonardo da Vinci (Sứ mệnh: 2)

While I thought that I was learning how to live, I have been learning how to die.
Good men by nature, wish to know. I know that many will call this useless work... men who desire nothing but material riches and are absolutely devoid of that of wisdom, which is the food and only true riches of the mind.
Men of lofty genius sometimes accomplish the most when they work least, for their minds are occupied with their ideas and the perfection of their conceptions, to which they afterwards give form.
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.
Men of lofty genius when they are doing the least work are most active.
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.
Who sows virtue reaps honor.
Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.
Marriage is like putting your hand into a bag of snakes in the hope of pulling out an eel.
The human foot is a masterpiece of engineering and a work of art.
Where the spirit does not work with the hand, there is no art.
Why does the eye see a thing more clearly in dreams than the imagination when awake?
Our life is made by the death of others.
Just as courage imperils life, fear protects it.
In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.
Water is the driving force of all nature.
Experience does not err. Only your judgments err by expecting from her what is not in her power.
As a well-spent day brings happy sleep, so a life well spent brings happy death.
I have offended God and mankind because my work didn't reach the quality it should have.
The noblest pleasure is the joy of understanding.
Life well spent is long.
Where there is shouting, there is no true knowledge.
Time stays long enough for anyone who will use it.
He who is fixed to a star does not change his mind.
All our knowledge has its origins in our perceptions.
The smallest feline is a masterpiece.
Nature never breaks her own laws.
Learning never exhausts the mind.
Art is never finished, only abandoned.
The greatest deception men suffer is from their own opinions.
The truth of things is the chief nutriment of superior intellects.
Beyond a doubt truth bears the same relation to falsehood as light to darkness.
There are three classes of people: those who see, those who see when they are shown, those who do not see.
It's easier to resist at the beginning than at the end.
Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.
Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.
Poor is the pupil who does not surpass his master.
Intellectual passion drives out sensuality.
All knowledge which ends in words will die as quickly as it came to life, with the exception of the written word: which is its mechanical part.
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.
Knowledge of the past and of the places of the earth is the ornament and food of the mind of man.
Just as food eaten without appetite is a tedious nourishment, so does study without zeal damage the memory by not assimilating what it absorbs.
Necessity is the mistress and guide of nature. Necessity is the theme and inventress of nature, her curb and her eternal law.
To such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another.
Just as courage is the danger of life, so is fear its safeguard.
Time abides long enough for those who make use of it.
Tears come from the heart and not from the brain.
The natural desire of good men is knowledge.
A beautiful body perishes, but a work of art dies not.
For, verily, great love springs from great knowledge of the beloved object, and if you little know it, you will be able to love it only little or not at all.
Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments.
Science is the captain, and practice the soldiers.