The book’s Conclusion offers reflections on the thematic and stylistic distinctiveness of the selected letter-writing, and its resonance for today’s readers – researchers and wider reading publics. The comparative and thematic connectedness of the correspondence of Mallarmé, Van Gogh, Morisot, Cézanne, and Zola has shone a powerful light on the capacity and the value of letters as life documents, as life-lessons, and, at times, as living letters. The Conclusion traces pathways for future critical work, drawing out some of the theoretical aspects of the book as a flexible form of critical practice for humanities researchers whether in the epistolary study of global elites or of individuals and communities whose everyday lives have yet to be fully valued by scholars and general audiences. The Conclusion reflects speculatively on the critical value and interdisciplinary potential of a comparative and thematic epistolarity studies within the landscape of modernist studies.