“Reward” is either of “gift” or by “contract.” When by contract, it is called “salary” and “wages”; which is benefit due for service performed or promised. When of gift, it is benefit proceeding from the “grace” of them that bestow it, to encourage or enable men to do them service. And therefore when the sovereign of a commonwealth appointeth a salary to any public office, he that receiveth it is bound in justice to perform his office; otherwise, he is bound only in honour to acknowledgment, and an endeavour of requital. For though men have no lawful remedy, when they be commanded to quit their private business, to serve the public, without reward or salary; yet they are not bound thereto, by the law of Nature, nor by the institution of the commonwealth, unless the service cannot otherwise be done; because it is supposed the sovereign may make use of all their means, insomuch as the most common soldier may demand the wages of his warfare as a debt.