Roger B. Taney,
Maryland v. Baltimore and Ohio Railroad Company…
“ And a provision, as in this case, that the party shall forfeit a particular sum, in case he does not perform an act required by law, has always, in the construction of statutes, been regarded not as a contract with the delinquent party, but as the punishment for an offence. Undoubtedly, in the case of individuals, the word forfeit is construed to be the language of contract, because contract is the only mode in which one person can become liable to pay a penalty to another for a breach of duty, or the failure to perform an abligation. ”
