Refusal to societal bullshit.
Not every artist is privileged enough to witness the effects of his/her work during his/her lifetime. The worth of their work is sometimes realized posthumously.
The saddest aspect of life is when talented people are ignored while they’re still alive. Recognition long after the person is gone only accentuates the tragedy. Yes, there are many famous people elevated to immortality who continue to live with us through their work.