“Think of your forefathers and of your posterity.”
John Quincy Adams (1767–1848) American politician, 6th president of the United States (in office from 1825 to 1829)
He here is translating a phrase of Calgacus in Vita Agricolae by Tacitus : Et majores et posteros cogitate.
Oration at Plymouth (1802)
Context: The barbarian chieftain, who defended his country against the Roman invasion, driven to the remotest extremity of Britain, and stimulating his followers to battle, by all that has power of persuasion upon the human heart, concludes his exhortation by an appeal to these irresistible feelings — "Think of your forefathers and of your posterity."
