Source: Persecution and the Art of Writing (1952), How to Study Spinoza's Theologico-Political Treatise, p. 144
“Read history. That’s it. Read history. Read and read and read in both primary and secondary sources. Learn to evaluate and compare. And then… write. Writing will be the hardest thing you ever do. But it’s the goal— write about the past and how we see it.”
Source: https://www.quora.com/How-do-I-become-historian-without-studying-history-in-University
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“I am a recluse at present & do nothing but write & read & read & write”
Source: The Collected Letters of Katherine Mansfield: Volume 1: 1903-1917

“Read. Read 1000 pages for every 1 page that you write.”

"The Noodle Factory", speech given at the dedication of the Shain Library at Connecticut College, New London
Palm Sunday (1981)
Context: And I believe that reading and writing are the most nourishing forms of meditation anyone has so far found. By reading the writings of the most interesting minds in history, we meditate with our own minds and theirs as well. This to me is a miracle.