Who said "The great work of my life is not yet finished."?

This quote is attributed to John Brown.

The great work of my life is not yet finished. - John Brown

"The great work of my life is not yet finished."

John Brown Work

Abolitionist, Militant American 1800–1859

"I John Brown am now quite certain that the crimes of this guilty land will never be purged away but with blood."

"Let us do our duty."

"The Bible is the word of God and is to be obeyed."

"I am here to lay down my life for the cause of justice."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."