In contracts every one is presume to know the condition of the person with whom he deals. A man making a contract with an infant cannot recover against him for a breach of the contract on the ground that he was not aware of his condition unless such lack of knowledge was due to fraud by the other party. In many cases it is by itself an agreement. In pleading, according to the course of the common law, the bond and its condition are to some intents and purposes regarded as distinct things. A condition is any portion of an agreement which regulates what the parties have a mind should be done if a case they foresee should come to pass.
Conditions sometimes suspend the obligation when it is to have no effect until they are fulfilled.
E.g., if I bind myself to pay you one thousand dollars on condition that the ship Thomas Jefferson shall arrive in the United States from Havre, the contract is suspended until the arrival of the ship. The condition sometimes rescinds the contract. E.g., when I sell you my horse on condition that he shall be alive on the first day of January, and he dies before that time. A condition may modify the contract. E.g., if I sell you two thousand bushels of corn, upon condition that my crop shall produce that much, and it produces only fifteen hundred bushels.