Islam has the ultimate answer to all these personal journey questions. No need for greek philosophy.
The only way in which religious thought survives the 21st century is a set of once sacred truths rendered palatable for the secular world. The past belonged to you, the present and future belongs to us.
The irony is that you've internalized the revealed truths of your worldview to the point that you don't realize you have any. You don't believe that your philosophy and ethics make any assumptions (but they do). And when confronted the only response is that they're not assumptions, they're self-evident truths.
You're no better than a medieval European peasant in that regard.