Right

"Always do right."

Mark Twain

In this quote mark is saying that you got to choose the right even if it is something bad. Always choose the right over wrong things 100% of the time. It cant be 99% of the time. He said 100%. So he's saying that you have to choose the right all the time. It is the best thing you can do. This is the key to success. 

When you choose the right 100% of the time it shows that you are loyal. It shows that you are a good person that is willing to do good. You have to choose the right everyday and all day! You cant do 99 things right but 1 thing wrong that makes you a ctw person.