Revolutions are not improvised. They are not made at will by individuals, and not even by the most powerful associations. They come about through force of circumstances, and are independent of any deliberate will or conspiracy. They can be foreseen ... but never can their explosion be accelerated. - Mikhail Bakunin, The Politics of the International
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This term includes all persons who are not parties to the contract, agrement or instrument of writing, by which their interest in the thing conveyed is sought to be affected.
But it is difficult to give a very definite idea of third persons, for sometimes those who are not parties to the contract, but who represent the rights of the original parties, as executors, are not to be considered third person.