" Act well your part; there all honor lies." 

Alexander Pope

- This quote is meaning to say that by acting well, your honor will show there. Also that you are a loyal person by doing your part well. As in act your part means that you have to do in a complete honest and right way. And that what it means by "there all honor lie". For example, being loyal to people as in not spreading rumors about them is a way of doing well.