Nathan Clifford, Brown v. Pierce — Opinion of the Court
“ Actual violence is not necessary to constitute duress, even at common law, as understood in the parent country, because consent is the very essence of a contract, and, if there be compulsion, there is no actual consent, and moral compulsion, such as that produced by threats to take life or to inflict great bodily harm, as well as that produced by imprisonment, is everywhere regarded as sufficient, in law, to destroy free agency, without which there can be no contract, because, in that state of the case, there is no consent. ”
