He's just 'building castles in the air' if he thinks he can open a restaurant without any money.
Millionaires built their 'castles' along the lake.
(..) Honor got your father killed. But if your mind is made up, I won't try to persuade you. Can I ask Your Grace how long you plan to stay at Castle Black? Are you bored of us already? You saved us from Mance Rayder's army. We will never forget that. But it's a question of survival. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3
(..) But I have to refuse you. I'm Lord Commander of the Night's Watch. My place is here. I'm giving you a chance to avenge your family. Take back the castle where you grew up. To rule the North. I wish I could fight beside you. Believe me, I do. But I swore a sacred vow at the Godswood. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3