I found this on google:
books.google.com/books?id=EDntUBHE3a8C&pg=PT775&lpg=PT775&dq=%22per formance+of+promises%22&source=bl&ots=qrKKtAszUf&s ig=MNoGgJ6qa8H3fRoJDOWyGybXcdI&hl=en&sa=X&ei=4qWEU KaYEaauiALo54CIDg&ved=0CCwQ6AEwAA
"In this respect, however, that law of nature, concerning the
performance of promises, is only comprized along with the rest."
Is it old English?