The human understanding is moved by those things most which strike and enter the mind simultaneously and suddenly, and so fill the imagination; and then it feigns and supposes all other things to be somehow, though it cannot see how, similar to those few things by which it is surrounded.
Again there is another great and powerful cause why the sciences have made but little progress; which is this. It is not possible to run a course aright when the goal itself has not been rightly placed.
Believing that I was born for the service of mankind, and regarding the care of the commonwealth as a kind of common property which, like the air and the water, belongs to everybody, I set myself to consider in what way mankind might be best served, and what service I was myself best fitted by nature to perform.
I think I tend to destroy the better paintings, or those that have been better to a certain extent. I try and take them further, and they lose all their qualities, and they lose everything. I think I would say that I destroy all the better paintings.