I was reading his autobiography for an intro to Quinn’s Prank (column to come) and came across this:
Writing for the press, cannot be recommended as a permanent resource to any one qualified to accomplish anything in the higher departments of literature or thought: not only on account of the uncertainty of this means of livelihood, especially if the writer has a conscience, and will not consent to serve any opinions except his own; but also because the writings by which one can live, are not the writings which themselves live, and are never those in which the writer does his best. Books destined to form future thinkers take too much time to write, and when written come, in general, too slowly into notice and repute, to be relied on for subsistence. Those who have to support themselves by their pen must depend on literary drudgery, or at best on writings addressed to the multitude; and can employ in the pursuits of their own choice, only such time as they can spare from those of necessity; which is generally less than the leisure allowed by office occupations, while the effect on the mind is far more enervating and fatiguing.