Aristotle
The greatest philosopher of ancient Greece, Aristotle (384–322 BC) was a student of Plato.

The founder of the philosophical school Likey.
Aristotle sharply criticizes Plato's doctrine of the existence of ideas as completely independent natural entities. According to Aristotle, ideas are only concepts reflecting the material world. The real world is only partially comprehended by our senses, since there is also a supersensible world of entities accessible to rational knowledge.
The theory of knowledge of Aristotle is built from the position of empiricism: the essence of things is learned through sensations. Experience is the foundation of knowledge. Above experience is the science that comprehends the common. I identified science with reason. Science proves its position logically. Above science is built on philosophy, which is largely the same logic. Knowledge of the laws of thinking (logic) Aristotle compared with wisdom. He is rightly considered the founder of formal logic.
(Automatic translation)

The teachings of Aristotle on nature and knowledge.
After the works of Aristotle, ethics becomes in fact an independent philosophical discipline. Only in society can behavior be virtuous or non-virtuous.