“Every comrade must be helped to understand that has long as we rely on the people, believe firmly in the inexhaustible creative power of the masses and hence trust and identify ourselves with them, we can surmount any difficulty, and no enemy can crush us while we can crush any enemy.”

According to Kenneth Owen Morgan (The Illustrated History of Britain (1984) p. 421) this was said by Macaulay in 1832. If so, he was quoting a letter written by Edmund Burke in 1777.
Attributed

Go Rin No Sho (1645), The Fire Book

Pearls of Wisdom

Source: Snow

Source: 5 August 2021, Speech after oath taking ceremony in Tehran https://www.tehrantimes.com/news/463741/Raisi-officially-takes-oath-of-office-as-Iran-s-president

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.

Source: An Old-Fashioned Girl

Willie's Question
The Disciple and Other Poems (1867)