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Law

Thomism recognizes four different species of law, which he defines as "an ordinance of reason for the common good, made by him who has care of the community, and promulgated":

The development of natural law is one of the most influential parts of Thomist philosophy. Aquinas says that " is nothing other than the light of the intellect planted in us by God, by which we know what should be done and what should be avoided. God gave this light and this law in creation... For no one is ignorant that what he would not like to be done to himself he should not do to others, and similar norms."

Aquinas argues that the Mosaic covenant was divine, though rightfully only given to the Jews before Christ; whereas the New Covenant replaces the Old Covenant and is meant for all humans.