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.
(..) - Ah, it's for the best. - Mm-hmm. When I saw you two at the party the other night, you seemed perfectly happy. Well, call me crazy, but it is my philosophy that in order to be successful, one project an image of success... - - Why? (..)1999 American Beauty