“We have heard the rationales offered by the nuclear superpowers. We know who speaks for the nations. But who speaks for the human species? Who speaks for Earth?”
Source: Cosmos (1980), p. 329
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Carl Sagan 365
American astrophysicist, cosmologist, author and science ed… 1934–1996Related quotes
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.

“He who knows does not speak; he who speaks does not know.”
Variant: Those who know, do not speak, those who speak, do not know.
Source: Tao Te Ching, Ch. 56

Foreign policy
Source: Remarks to students and educators in Qom (13 March 1979)

1950s, The Russell-Einstein Manifesto (1955)

“There are people who would never be in love had they not heard [others] speak of love”
Il y a des gens qui n'auraient jamais été amoureux s'ils n'avaint jamais entendu parler de l'amour.
Maxim 136. Variant translations:
People would never fall in love if they hadn’t heard love talked about.
There are some people who would never have fallen in love if they had not heard there was such a thing.
Reflections; or Sentences and Moral Maxims (1665–1678)

“Who knows but that, on the lower frequencies, I speak for you?”
Epilogue (last line of the novel).
Source: Invisible Man (1952)