Shiki’s advice to haiku masters.
1. Read all worth while books and think over their good and bad points.
2. Know all kinda of haiku but have your own style.
3. Gather new material directly. Do not take it from old haiku.
4. Know something about other literature.
5. Know at least something about all art.
From “An Introduction to Haiku” by Harold G. Henderson. 1958