On [:] Reverse | Leo Tolstoy, 1867

Diego Velázquez, Las Meninas (The Ladies-in-waiting), 1656

“Perhaps you are right for yourself,” he added after a short pause, “but everyone lives in his own way. You lived for yourself and say you nearly ruined your life and only found happiness when you began living for others. I experienced just the reverse. I lived for glory. — And after all what is glory? The same love of others, a desire to do something for them, a desire for their approval. — So I lived for others, and not almost, but quite, ruined my life. And I have become calmer since I began to live only for myself.”

Leo Tolstoy, War and Peace, 1867

Also:
Book//mark – The Kingdom of God Is Within You | Leo Tolstoy, 1894
Tolstoy’s illness is beyond me | A Letter by Anton Chekhov, 1900