Ramon Llull in the context of "Christian Kabbalah"

A hierarchy (from Greek: ἱεραρχία, hierarkhia, 'rule of a high priest', from hierarkhes, 'president of sacred rites') is an arrangement of items (objects, names, values, categories, etc.) that are represented as being "above", "below", or "at the same level as" one another. Hierarchy is an important concept in a wide variety of fields, such as architecture, philosophy, design, mathematics, computer science, organizational theory, systems theory, systematic biology, and the social sciences (especially political science).

A hierarchy can link entities either directly or indirectly, and either vertically or diagonally. The only direct links in a hierarchy are to one's immediate superior or subordinate. Hierarchical links can extend "vertically" upwards or downwards via multiple links in the same direction, following a path. All parts of the hierarchy that are not linked vertically to one another can also be "horizontally" linked through a path by traveling up the hierarchy to find a common direct or indirect superior, and then down again. This is a system of co-workers or colleagues; each reports to a common superior, but they have the same relative amount of authority. Organizational forms exist that are both alternative and complementary to hierarchy. Heterarchy is one such form.

Within many denominations of Christianity, Christian perfection is the theological concept of the process or the event of achieving spiritual maturity or perfection. The ultimate goal of this process is union with God characterized by pure love of God and other people as well as personal holiness or sanctification. Other terms used for this or similar concepts include entire sanctification, holiness, perfect love, the baptism with the Holy Spirit, the indwelling of the Holy Spirit, baptism by fire, the second blessing, and the second work of grace.

Understandings of the doctrine of Christian Perfection vary widely between Christian traditions, though these denominational interpretations find basis in Jesus' words recorded in Matthew 5:48: "Be ye therefore perfect, even as your Father which is in heaven is perfect" (King James Version).

Alternatives to Darwinian evolution have been proposed by scholars investigating biology to explain signs of evolution and the relatedness of different groups of living things. The alternatives in question do not deny that evolutionary changes over time are the origin of the diversity of life, nor that the organisms alive today share a common ancestor from the distant past (or ancestors, in some proposals); rather, they propose alternative mechanisms of evolutionary change over time, arguing against mutations acted on by natural selection as the most important driver of evolutionary change.

This distinguishes them from certain other kinds of arguments that deny that large-scale evolution of any sort has taken place, as in some forms of creationism, which do not propose alternative mechanisms of evolutionary change but instead deny that evolutionary change has taken place at all. Not all forms of creationism deny that evolutionary change takes place; notably, proponents of theistic evolution, such as the biologist Asa Gray, assert that evolutionary change does occur and is responsible for the history of life on Earth, with the proviso that this process has been influenced by a god or gods in some meaningful sense.

In philosophy, the natural order is the moral source from which natural law seeks to derive its authority. Natural order encompasses the natural relations of beings to one another in the absence of law, which natural law attempts to reinforce. In contrast, divine law seeks authority from God, and positive law seeks authority from government.