“The least I can do is speak out for the hundreds of chimpanzees who, right now, sit hunched, miserable and without hope, staring out with dead eyes from their metal prisons. They cannot speak for themselves.”
Reported in Janelle Rohr, Animal rights: opposing viewpoints (1989), p. 100; Jane Goodall and Jennifer Lindsey, Jane Goodall: 40 Years at Gombe (1999), p. 6. Occasionally misreported in truncated form, as "The least I can do is speak out for those who cannot speak for themselves", in, e.g., quote honored on XOEarth eco money http://xoearth.org/jane-goodall/
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Jane Goodall 48
British primatologist, ethologist, and anthropologist 1934Related quotes

“Out of five hundred who speak glibly of love, not one can spell the first letter of his name.”
Tel cinc cent parolent d'amur,
N'en sevent pas le pior tur,
Ne que est loiax druerie.
"Graelent", line 77; p. 149.
Misattributed

Source: Quotes from secondary sources, Dictionary of Burning Words of Brilliant Writers, 1895, P. 230.

Letter to Thomas Jefferson (15 July 1817)
1810s
Source: https://www.vanguardngr.com/2021/03/kidnap-of-schoolgirls-stop-paying-ransom-to-criminals-solanke-tells-fg/ Folake Solanke in 2021 speaking out against the ills in society.

“If you speak English, you speak at least a part of more than a hundred languages.”
As quoted in * http://learningenglish.voanews.com/content/a-23-2005-11-15-voa1-83125067/117153.html
2005-11-15
VOA News
Avi
Arditti

Statements in PBS interview with Margaret Warner (October 11, 2013)
“I speak from ignorance.
Who once learned much, but speaks from ignorance now.”
Poem Last of the Chiefs published in: Nathaniel Tarn (1965) Old savage, young city. p. 18.