Authors:

There is but one Paris and however hard living may be here, and if it became worse and harder even—the French air clears up the brain and does good—a world of good.

Naomi E. Maurer, Vincent van Gogh, Paul Gauguin (1998). “The Pursuit of Spiritual Wisdom: The Thought and Art of Vincent Van Gogh and Paul Gauguin”, p.53, Fairleigh Dickinson Univ Press
There is but one Paris and however hard living may be here, and if it became worse and harder even—the French air clears up the brain and does good—a world of good.