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.
(..) a race of Peeping Toms. What people ought to do is get outside their own house and look in for a change. Yes, sir. How's that for a bit of homespun philosophy? Reader's Digest, April . Well, I only quote from the best. Yeah. (..)1954 Rear Window