Salmon P. Chase,
Hepburn v. Griswold — Opinion of the Court
“ It is difficult to say to what express power the authority to make notes a legal tender in payment of pre-existing debts may not be upheld as incidental, upon the principles of this argument. Is there any power which does not involve the use of money? And is there any doubt that Congress may issue and use bills of credit as money in the execution of any power? The power to establish post-offices and post-roads, for example, involves the collection and disbursement of a great revenue. Is not the power to make notes a legal tender as clearly incidental to this power as to the war power? ”
