“prepare capsules, extracts, powders, and tinctures.”

Translation of "不爱红装爱武装" (line from "Militia Women", a 1961 poem by Mao Zedong), in Illustrated Poems of Mao Zedong, trans. Xu Yuanchong (Beijing: China Intercontinental Press, 2006), p. 102

On liquid diets, in New York Herald Tribune (29 December 1960).

Source: Experience and Education

Source: The Sea of Monsters

Source: 1880s, Incidents and Anecdotes of the Civil War (1885), p. 269

The Ballot or the Bullet (1964), Speech in Detroit, Michigan (12 April 1964)
Context: And 1964 looks like it might be the year of the ballot or the bullet. Why does it look like it might be the year of the ballot or the bullet? Because Negroes have listened to the trickery, and the lies, and the false promises of the white man now for too long. And they’re fed up. They’ve become disenchanted. They’ve become disillusioned. They’ve become dissatisfied, and all of this has built up frustrations in the black community that makes the black community throughout today more explosive than all of the atomic bombs the Russians can ever invent. Whenever you got a racial powder keg sitting in your lap, you’re in more trouble than if you had an atomic powder keg sitting in your lap. When a racial powder keg goes off, it doesn’t care who it knocks out the way. Understand this, it’s dangerous.

Popularized by Blacker in the poem "Oliver's Advice", http://books.google.com/books?id=JmEaAQAAIAAJ&dq=%22Oliver%27s+Advice%22+Cromwell&q=%22Oliver%27s+Advice%22+Cromwell#v=snippet&q=%22Oliver's%20Advice%22%20Cromwell&f=false published under the pseudonym Fitz Stewart in The Dublin University Magazine, December 1834, p. 700; where the quote is attributed to Oliver Cromwell (hence the poem's title). The repeated line in the poem is "Put your trust in God, my boys, but keep your powder dry."
Misattributed

Attributed by William Blacker (not to be confused with Valentine Blacker), who popularized the quote with his poem "Oliver's Advice" http://books.google.com/books?id=JmEaAQAAIAAJ&dq=%22Oliver%27s+Advice%22+Cromwell&q=%22Oliver%27s+Advice%22+Cromwell#v=snippet&q=%22Oliver's%20Advice%22%20Cromwell&f=false, published under the pseudonym Fitz Stewart in The Dublin University Magazine, December 1834, p. 700; where the attribution to Cromwell appears in a footnote describing a "well-authenticated anecdote" that explains the poem's title. The repeated line in Blacker's poem is "Put your trust in God, my boys, but keep your powder dry".
Attributed
Variant: Trust in God and keep your powder dry.
Variant: Put your trust in God, but keep your powder dry.