This is also sometimes quoted as "The millions of people, armed in the holy cause of liberty".
1770s, "Give me liberty, or give me death!" (1775)
Context: They tell us, sir, that we are weak; unable to cope with so formidable an adversary. But when shall we be stronger? Will it be the next week, or the next year? Will it be when we are totally disarmed, and when a British guard shall be stationed in every house? Shall we gather strength by irresolution and inaction? Shall we acquire the means of effectual resistance by lying supinely on our backs and hugging the delusive phantom of hope, until our enemies shall have bound us hand and foot?
Sir, we are not weak if we make a proper use of those means which the God of nature hath placed in our power. Three millions of people, armed in the holy cause of Liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us. Besides, sir, we shall not fight our battles alone. There is a just God who presides over the destinies of nations, and who will raise up friends to fight our battles for us. The battle, sir, is not to the strong alone; it is to the vigilant, the active, the brave.
“We are referred to the period the Revolution [of 1688]. We are told to be contented with those securities for our liberties which our ancestors provided…It is pleaded as an invincible bar to any improvement proposed in favour of the people, though it is not allowed the smallest authority when it is opposed to an enlargement of power: when the crown is to be invested with any new prerogatives, the ancient landmarks may be removed without a scruple, but they are sacred against the best founded claims of the people…The point now is, to inquire, whether, in the course of human affairs, and the changes which time and events have produced, the principle of freedom has preserved those bulwarks and securities with which it was the object of the Revolution to invest it? Whether the crown has not gained a degree of influence beyond the regulated portion assigned by the establishments of our ancestors, and which either has been, or threatens to become, injurious to cause of liberty and to the of the empire?”
Speech in the House of Commons (25 April 1800), reported in The Parliamentary History of England, from the Earliest Period to the Year 1803. Vol. XXXV (London: 1819), pp. 91-93.
1800s
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Charles Grey, 2nd Earl Grey 32
Prime Minister of the United Kingdom of Great Britain and I… 1764–1845Related quotes

Speech to the Economic Students' Union at the School of Economics and Political Science, London (14 December 1900), quoted in The Times (17 December 1900), p. 13.
1900s

As quoted in Beverley Male (1982) Revolutionary Afghanistan: A Reappraisal, page 183

Speech about Declaration of Independence (1776)

2015, State of the Union Address (January 2015)
Context: When we make rash decisions, reacting to the headlines instead of using our heads; when the first response to a challenge is to send in our military -- then we risk getting drawn into unnecessary conflicts, and neglect the broader strategy we need for a safer, more prosperous world. That’s what our enemies want us to do. I believe in a smarter kind of American leadership. We lead best when we combine military power with strong diplomacy; when we leverage our power with coalition building; when we don’t let our fears blind us to the opportunities that this new century presents. That’s exactly what we’re doing right now. And around the globe, it is making a difference. [... ] That’s how America leads -- not with bluster, but with persistent, steady resolve.

§ 15
1780s, Memorial and Remonstrance Against Religious Assessments (1785)

Source: The Freedom of a Christian (1520), p. 51