What was granger's philosophy of life, taught to him by his grandfather, and handed on to montag?

I believe the answer is: Granger compares people to Phoneix's.

 Phoneix's are people who rise up from the ashes again when they are burnt.She believes that people are the creatures that have overwhelming psychological resistance and have the inner ability to get back at our feet every time a Trouble/ problem brought us down.

The one that most represents the earths mantle would be the skin since the mantle is the upper part of the earths depths which is just like the skin of an apple.

Sjjdhdhdhd isk just trying to get points 12 r̰̃ṵ̃