Note 25 — Chapter XI · On Promises.
A. C. (Archibald Colin) Campbell translation
"A promise is in the nature of a verbal covenant, and wants nothing but the solemnity of writing and sealing to make it absolutely the same. If therefore it be to do any explicit act, it is an express contract, as much as any covenant; and the breach of it is an equal injury."—Blackst. Com. b. iii. ch. ix. sect. 3.