It is said that consideration must not be confounded with motive. It is true that it must not be confounded with what may be the prevailing or chief motive in actual fact. A man may promise to paint a picture for five hundred dollars, while his chief motive may be a desire for fame. A consideration may be given and accepted, in fact, solely for the purpose of making a promise binding. But, nevertheless, it is the essence of a consideration, that, by the terms of the agreement, it is given and accepted as the motive or inducement of the promise. Conversely, the promise must be made and accepted as the conventional motive or inducement for furnishing the consideration. The root of the whole matter is the relation of reciprocal [294] conventional inducement, each for the other, between consideration and promise. A good example of the former branch of the proposition is to be found in a Massachusetts case. The plaintiff refused to let certain wood be removed from his land by one who had made an oral bargain and given his note for it, unless he received additional security. The purchaser and the plaintiff accordingly went to the defendant, and the defendant put his name upon the note. The plaintiff thereupon let the purchaser carry off the wood. But, according to the testimony, the defendant signed without knowing that the plaintiff was to alter his position in any way on the faith of the signature, and it was held that, if that story was believed, there was no consideration. /1/ An illustration of the other half of the rule is to be found in those cases where a reward is offered for doing something, which is afterwards done by a person acting in ignorance of the offer. In such a case the reward cannot be claimed, because the alleged consideration has not been furnished on the faith of the offer. The tendered promise has not induced the furnishing of the consideration. The promise cannot be set up as a conventional motive when it was not known until after the alleged consideration was performed. /2/