Shakespeare wrote that “Conscience is but a word cowards use, devised at first to keep the strong in awe” (Richard III V.iv.1.7). Conscience, indeed, can be an excuse for vice or invoked to avoid doing one's duty. When the duty is a true duty, conscientious objection is wrong and immoral. When there is a grave duty, it should be illegal. A doctors' conscience has little place in the delivery of modern medical care. What should be provided to patients is defined by the law and consideration of the just distribution of finite medical resources, which requires a reasonable conception of the patient's good and the patient's informed desires (box). If people are not prepared to offer legally permitted, efficient, and beneficial care to a patient because it conflicts with their values, they should not be doctors. Doctors should not offer partial medical services or partially discharge their obligations to care for their patients.