Thomas Aquinas believed that there was an appropriated assimilation or likeness to God found in creatures and creation. Some likeness must be found between an effect and its cause. It is in the nature of any agent to do something like itself. Thus, God also gives to creatures and creation all their perfections; and thereby he has with all creatures a likeness.
Additionally, the cause of variety and the multitude of things in creation find their cause in God. Thomas contrasts himself with early Greek philosophers such as Democritus and the other atomists who argued that the distinction of things come from chance according to the movement of matter.