Breaking human lawsSpanish philosopher Francisco Suárez continued in Aquinas’s tradition, arguing that natural law is the foundation of human law. He described how human laws could be unjust, and placed a greater emphasis on individual liberty and freedom. Man-made laws could, in the view of Suárez, was accountable only to God, and not to the Church or to his or her subjects. By distinguishing between different sources of laws—natural, divine, and human—Suárez rejected the mixing of the secular and the sacred, and separated the realms of power. He also introduced the notion of the social contract, proposing that the ruler governs by the consent of the people, who can also legitimately withdraw their consent if the ruler does not respect the demands of natural law.