Romans 6:1 — What shall we say then? Shall we continue in sin, that grace may abound?
Continue = abide — so, shall we sin to obtain grace?
Paul is countering Antinomianism — a school of thought that says grace leads to sin because we aren't condemned for our sins, that the moral law is of no use and we are under no obligation to it.
Chapter 5 shows how God gives life. Chapter 6 shows how I should live that life — unto God.