"Live and let live" is pretty a pretty good one. I am a more conservative Christian in religion yet more liberal minded in politics. This means half my friends would be really upset by my politics and the other half would be really upset my religious beliefs. Instead of upsetting everyone, I choose to be respectful of everyone. They can guess by my silence that I'm not exactly in their camp but I'm not going to "freak out" on them either, just because I don't agree with their viewpoint or lifestyle choice. I have friends from many walks of life, some who are atheists, one who is a witch! I respect them all for the choices they have made and feel it is just fine. I am not here to judge them or tell them how to live. Only God can do that - not me! I am here to be their friend and support them. So, for all these reasons and more, I think "live and let live" is a good way to approach life. I like to think we can stay positively connected to each other, in varying degrees, by focusing on what our commonalities are.
My other one is "Do or do not. There is no try." This is something the character Yoda said in a Star Wars movie. I really live by this concept, too. When I want to go to another country, I do! When I want a new car, I get one! When I want a new job, I get one! I don't "wish" it will happen or "hope" it will happen or "pray" it will happen. I MAKE it happen! I love that the power within us all is there, ready to be tapped into, if only we will.