Misc: GENERAL KNOWLEDGE; What do the Greeks call the Elgin marbles?

Questions

'The greater part of our happiness or misery depends on our disposition and not our circumstances.'?

'The greater the difficulty, the more the glory in surmounting it.'?

'The greatest difficulties lie where we are not looking for them.'?

'The greatest happiness of life is the conviction that we are loved - loved for ourselves, or rather, loved in spite of ourselves.'?

What is another name for iron oxide?