95% sureThese words were traced back to where they first appeared. That source is listed below.
What turned up
Maria Mitchell: Life, Letters, and Journals (comp. Phebe Mitchell Kendall, 1896) — Project Gutenberg #10202, from her Vassar lecture notes, c. 1865-1885.
Work
Maria Mitchell: Life, Letters, and Journals (comp. Phebe Mitchell Kendall, 1896) — Project Gutenberg #10202
Occasion
circa 1865-1885 · Vassar College · from her astronomy lecture notes urging students to think for themselves
Sources checked
gutenberg.orgChecked using claude-sonnet-5, 21 August 2026Ch. IX — read in full: introduces her point that women should trust their own investigations rather than inherited authority.
Nothing made from these words yet — is where they get made.