His 'philosophy of life' [=his way of living] is to treat people as he would like to be treated.
My 'philosophy' is to live and let live. [=let other people live the way they want to]
Her main cooking 'philosophy' is to use only fresh ingredients.
(..) and their children... I'll, uh, take that as my cue, if I may. First of all, Leslie practiced Buddhism, which to her was a philosophy and not an organized religion. In fact, Leslie abhorred all organized religions. To her, they were the most dangerous fairy tales ever invented, (..)2016 Captain Fantastic