Historical clue formulations

• Who wrote "Our life is frittered away by detail … Simplify, simplify" — 2023-02-25
• He wrote "All good things are wild and free" — 2022-08-19
• Transcendentalist who wrote "Walden" — 2022-06-28
• "Civil Disobedience" essayist, 1849 — 2020-01-24
• Philosopher who wrote "Disobedience is the true foundation of liberty" — 2019-10-07
• He wrote "In wildness is the preservation of the world" — 2017-12-23
• "Walden" writer — 2016-09-25
• See 70-Across — 2009-09-30
• Noted transcendentalist — 1996-11-09
• Walden Pond habitue — 1994-05-18