Art is not merely an imitation of the reality of nature, but in truth a metaphysical supplement to the reality of nature, placed alongside thereof for its conquest.
My scientific work is motivated by an irresistible longing to understand the secrets of nature and by no other feeling. My love for justice and striving to contribute towards the improvement of human conditions are quite independent from my scientific interests.
Our moods do not believe in each other. To-day I am full of thoughts, and can write what I please. I see no reason why I should not have the same thought, the same power of expression, to-morrow. What I write, whilst I write it, seems the most natural thing in the world; but yesterday I saw a dreary vacuity in this direction in which now I see so much; and a month hence, I doubt not, I shall wonder who he was that wrote so many continuous pages. Alas for this infirm faith, this will not strenuous, this vast ebb of a vast flow! I am God in nature; I am a weed by the wall.
It is better to do one's own duty, however defective it may be, than to follow the duty of another, however well one may perform it. He who does his duty as his own nature reveals it, never sins.