The dialogue on Game of Thrones isn't always the easiest to follow whether you haven't read the books,and one of the edges that those who read the novels may hold is recognizing the House mottoes. See, in the Seven Kingdoms, or each family (or House) has their own motto,a saying that represents them. While the show doesn't explicitly disclose you which is which, the writers hold used clever ways to hold the characters say their own motto, and in some cases,the phrases hold been used as episode titles. In case you don't know why the Starks say "Winter is coming" so much or why the Lannisters seem really into paying back their debts, this rundown of each House motto is for you.
Source: popsugar.com