Here is Musashi, in his manifesto for life and practice, Dokkōdō, written in 1645, a week before he died:
The 21 precepts of Dokkōdō:
1. Accept everything just the way it is.
2. Do not seek pleasure for its own sake.
3. Do not, under any circumstances, depend on a partial feeling.
4. Think lightly of yourself and deeply of the world.
5. Be detached from desire your whole life long.
6. Do not regret what you have done.
7. Never be jealous.
8. Never let yourself be saddened by a separation.
9. Resentment and complaint are appropriate neither for oneself or others.
10. Do not let yourself be guided by the feeling of lust or love.
11. In all things have no preferences.
12. Be indifferent to where you live.
13. Do not pursue the taste of good food.
14. Do not hold on to possessions you no longer need.
15. Do not act following customary beliefs.
16. Do not collect weapons or practice with weapons beyond what is useful.
17. Do not fear death.
18. Do not seek to possess either goods or fiefs for your old age.
19. Respect Buddha and the gods without counting on their help.
20. You may abandon your own body but you must preserve your honour.
21. Never stray from the way.
And here is Kerouac, Belief and Technique for Modern Prose, written 1958 and published the year after:
1. Scribbled secret notebooks, and wild typewritten pages, for yr own joy
2. Submissive to everything, open, listening
3. Try never get drunk outside yr own house
4. Be in love with yr life
5. Something that you feel will find its own form
6. Be crazy dumbsaint of the mind
7. Blow as deep as you want to blow
8. Write what you want bottomless from bottom of the mind
9. The unspeakable visions of the individual
10. No time for poetry but exactly what is
11. Visionary tics shivering in the chest
12. In tranced fixation dreaming upon object before you
13. Remove literary, grammatical and syntactical inhibition
14. Like Proust be an old teahead of time
15. Telling the true story of the world in interior monolog
16. The jewel center of interest is the eye within the eye
17. Write in recollection and amazement for yourself
18. Work from pithy middle eye out, swimming in language sea
19. Accept loss forever
20. Believe in the holy contour of life
21. Struggle to sketch the flow that already exists intact in mind
22. Dont think of words when you stop but to see picture better
23. Keep track of every day the date emblazoned in yr morning
24. No fear or shame in the dignity of yr experience, language & knowledge
25. Write for the world to read and see yr exact pictures of it
26. Bookmovie is the movie in words, the visual American form
27. In praise of Character in the Bleak inhuman Loneliness
28. Composing wild, undisciplined, pure, coming in from under, crazier the better
29. You're a Genius all the time
30. Writer-Director of Earthly movies Sponsored & Angeled in Heaven.