I've taken Feynman's rule as the guiding star of all communication: if you can not explain your point of view understandably, you do not understand it well enough yourself. (Implication: shut the f##k up until you do, and can.) I've added the requirement from Saint-Exupéry: "Perfection is achieved, not when there is nothing left to add, but nothing left to take away." Then I've taken that to combination to its logical extreme:
Make your point in seven words.
More recently I have learned that Cicero had the same rule for his effective communication. Although he had the upper limit at ten words.
The Finnish language has a wonderful capability to express all of that in a single word: "Asiaan!" -- to convey the same message in English you need to waste five words in total, "get to the point already".