Full Idea
In the ancient world Plato was seen as a pivotal figure, the first philosopher who was concerned to systematize his ideas.
Gist of Idea
Plato was the first philosopher who was concerned to systematize his ideas
Source
Julia Annas (Ancient Philosophy: very short introduction [2000], Ch.6)
Book Reference
Annas,Julia: 'Ancient Philosophy: a very short introduction' [OUP 2000], p.101