Joshua Lott/Getty ImagesJohn McCain.

Sen. John McCain, who has served in the Senate since 1987, has died at 81.

Here are 10 of the Arizona senator and former Republican presidential candidate's best quotes on courage, happiness, and character.

John McCain on fighting for a cause

John McCain on the nature of Americans

John McCain on glory

John McCain on courage

John McCain on character and happiness

John McCain on power

John McCain on the importance of shared values

John McCain on the importance of shared values

John McCain on America's greatest strength

John McCain on America's greatest strength

John McCain on the national consensus

John McCain on America