What a speech. Hindu philosophy in a nutshell. All mankind should know this as this is the truth. I am really blessed. May the almighty bless all and protect all.
Please study more. The vedic darshan rishi existed before the Ramayana. That is more than 7000 years ago. Yet you ascribe Gautam, Kapil and others to 500bc during the Greek philosophers
Sir ji , can you provide some archeological evidences of all these sage in 600 BCE. And these knowledge carried one generation to other generation by oral tradition , how will you prove it. When it got written , in which language and script?