It is not enough to have a good rule, or set of principles, to live by. We need an understanding that our actions have consequences. With this understanding we can then make contextual decisions on how to treat others and our environment. Place yourself in each situation.
Great is individually defined. Too many people are living life with no direction. To have a guiding principle or dream gives one true meaning in life as milestones are set and reached, and the dream begins to become reality. We cannot be bored, as dreams naturally expand.