Full Idea
If any fault of man be sufficient to discharge our covenant made, the same ought in reason to have been sufficient to have hindered the making of it.
Gist of Idea
If there is a good reason for breaking a contract, the same reason should have stopped the making of it
Source
Thomas Hobbes (Leviathan [1651], 1.15)
Book Reference
Hobbes,Thomas: 'Leviathan', ed/tr. Macpherson,C.B. [Penguin 1981], p.206