“If we teach today’s students as we taught yesterday’s, we rob them of tomorrow.”

Still. A. T., Journal of Osteopathy, p. 127. https://www.atsu.edu/museum/subscription/pdfs/JournalofOsteopathyVol5No31898August.pdf/.

Source: The Next American Revolution: Sustainable Activism for the Twenty-First Century

President Clinton's speech at the 200th anniversary of the University of North Carolina.
This quote was later used as a sample by electronic duo Cosmic Gate in their track "Tomorrow"
2000s

"Tomorrow" (1919), as translated in A Soviet Heretic : Essays by Yevgeny Zamyatin (1970) edited and translated by Mirra Ginsburg
Context: Yesterday, there was a tsar, and there were slaves; today there is no tsar, but the slaves remain; tomorrow there will be only tsars. We march in the name of tomorrow's free man — the royal man. We have lived through the epoch of suppression of the masses; we are living in an epoch of suppression of the individual in the name of the masses; tomorrow will bring the liberation of the individual — in the name of man. Wars, imperialist and civil, have turned man into material for warfare, into a number, a cipher. Man is forgotten, for the sake of the sabbath. We want to recall something else to mind: that the sabbath is for man.
The only weapon worthy of man — of tomorrows's man — is the word.

Source: Love, Stargirl

Estoy en el ayer, en el hoy. ¿Y en mañana? En el mañana estuve.
Voces (1943)

Text of television interview with Mike Wallace, New York, New York, October 17 and 18, 1960, as quoted in Walter P Reuther: Selected Papers (1961), by Henry M. Christman, p. 310
1950s, Television interview with Mike Wallace (1960)