I've learned, I think, to be able to distinguish between the necessary and the unnecessary as far as my limited outside time is concerned. Saying "no" politely is a necessity if one wants to lead any kind of stable life. ↗
And here a most heinous charge is made, that the nation has been burdened with unnecessary expenses for the sole purpose of preventing the discharge of our debts and the abolition of taxes. ↗
Government is an unnecessary evil. Human beings, when accustomed to taking responsibility for their own behavior, can cooperate on a basis of mutual trust and helpfulness. ↗
Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. ↗