| The art of procreation and the members employed therein are so repulsive, that if it were not for the beauty of the faces and the adornments of the actors and the pent-up impulse, nature would lose the human species. |
| Learning never exhausts the mind. |
| Nothing strengthens authority so much as silence. |
| Study without desire spoils the memory, and it retains nothing that it takes in. |
| Patience serves as a protection against wrongs as clothes do against cold. |
| Nature never breaks her own laws. |
| All our knowledge originates in opinion. |
| The knowledge of all things is possible. |
| The painter has the Universe in his mind and hands. |
| Study without desire spoils the memory, and it retains nothing that it takes in. |