"I am not bound to win, but I am bound to be true. I must stand with anybody that stands right, and with him while he is right, and part with him when he goes wrong" - Abraham Lincoln 

He is telling us to stick up for each other. Be each others hands and always be with people how have good character. Don't be with the people who don't choose the right. The more you are right the more others will stand with you. Be other's role models don't be a bad role model.  Be with people who are right and when the do in the other direction then you should lead them back into the right place. Don't choose the be wrong you should always be with right people and most importantly be right yourself. For example, if you are with people who are always on their best behavior then all of a sudden do bad things and change their whole personality and behavior then you should try to correct them. And if they don't go back to the way they were then don't be with them anymore. Because they will be a bad influence. Or if you hang out with bad people and they are all of sudden the nicest people who respect other then you should stand by them because they will influence you in doing good things.