Who said "The abolitionist cause is the cause of humanity itself."?

This quote is attributed to John Brown.

The abolitionist cause is the cause of humanity itself. - John Brown

"The abolitionist cause is the cause of humanity itself."

John Brown Justice

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."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."