“Tomorrow, Napoleon will be under our ramparts.”

Space: What love's got to do with it - The Space Review (2004)

Source: The Political Economy Of Growth (1957), Chapter Five, On The Roots Of Backwardness, p. 144

Spring of 1970; referring to the U.S. involvement in Vietnam – as quoted in Lloyd Alexander (1991) by Jill P. May, p. 10

The American Leviathan: The Republic in the Machine Age (1931) co-written with William Beard, p. 39
Context: If this statement by Judge Cooley is true, and the authority for it is unimpeachable, then the theory that the Constitution is a written document is a legal fiction. The idea that it can be understood by a study of its language and the history of its past development is equally mythical. It is what the Government and the people who count in public affairs recognize and respect as such, what they think it is. More than this. It is not merely what it has been, or what it is today. It is always becoming something else and those who criticize it and the acts done under it, as well as those who praise, help to make it what it will be tomorrow.

Dido and Aeneas (opera; music by Henry Purcell)

Speech at Founding Rally of the Organization of Afro-American Unity (28 June 1964), as quoted in By Any Means Necessary (1970)
By any means necessary: speeches, interviews, and a letter (1970)
Variant: The future belongs to those who prepare for it today.
Source: Malcolm X, Black Liberation, and the Road to Workers' Power
Context: Education is an important element in the struggle for human rights. It is the means to help our children and our people rediscover their identity and thereby increase their self respect. Education is our passport to the future, for tomorrow belongs only to the people who prepare for it today.

Source: Perfect Fifths