It’s not a subject.
It’s about having an opinion on the purpose of our live’s and the entire existence.
It’s a matter of fact that human opinions change,so do their philosophy.
Thus we have plenty of philosopher’s and their respective philosophy.
We do have philosopher’s in disguise.
It’s none other than we,the common men.
The only difference between them and us is that their works are recorded where’as our thoughts are spread among ourselve’s and to the future generations.
A philosophy is well appreciated,if it’s aimed at making our live’s better