Art is purposiveness without purpose.
The only thing permanent is change.
Act in such a way that you will be worthy of being happy.
An organized product of nature is that in which all the parts are mutually ends and means.
The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.
The ultimate destiny of the human race is the greatest moral perfection, provided that it is achieved through human freedom, whereby alone man is capable of the greatest happiness.