Nature never breaks her own laws.
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.
Men of lofty genius when they are doing the least work are most active.
Knowledge of the past and of the places of the earth is the ornament and food of the mind of man.
Beyond a doubt truth bears the same relation to falsehood as light to darkness.
Where the spirit does not work with the hand, there is no art.
All our knowledge has its origins in our perceptions.
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.
Science is the captain, and practice the soldiers
A beautiful body perishes, but a work of art dies not.
I have offended god and mankind because my work didn't reach the quality it should have.
Intellectual passion drives out sensuality.
Every action needs to be prompted by a motive.
You can have no dominion greater or less than that over yourself.
Art is never finished, only abandoned.
Nothing strengthens authority so much as silence.
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.
A well-spent day brings happy sleep.
The noblest pleasure is the joy of understanding.
Learning never exhausts the mind.
Water is the driving force of all nature.
The greatest deception men suffer is from their own opinions.
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.
While I thought that I was learning how to live, I have been learning how to die.