First rule: rules are made for breaking. There are always mitigating circumstances. It's OK to break the rules.
Second rule: it's good to have some basic rules (see first rule). Helps to channel our energies.
Here's a short list of rules I am living by at this particular moment...
Meditate every day.
Listen to music every day.
Write every day.
Pick up my guitar and strum every day.
Rise early. Go to bed early. (hat tip: Benjamin Franklin)
Simplify.
Think first.
Don't over-think.
Refuse to bury Hope (hat tip: Pope Francis)
Always be moving.
Laugh.
Love.
Live in the moment.
Always be humble.