Having grown tired of reading secondary material in my study of philosophy, I have decided to read primary texts in a chronological, rather than thematic, order. I have started with Plato and have read most of the works I can find online or at my library. Before I move on to Aristotle, I would like your advice. Do you think a chronological approach is a good idea for someone untrained in philosophy? Do you think I should read every work by a given philosopher, or are there 'key' works that serve as their primary contribution to the field? If the latter, are there any lists that you are aware of that state what those key works are?