Full Idea
He therefore that breaketh his covenant, and consequently declareth that he thinks he may with reason do so, cannot be received into any society.
Gist of Idea
No one who admitted to not keeping contracts could ever be accepted as a citizen
Source
Thomas Hobbes (Leviathan [1651], 1.15)
Book Reference
Hobbes,Thomas: 'Leviathan', ed/tr. Macpherson,C.B. [Penguin 1981], p.205