The Golden Rule. Something will come back to you many-fold. And we're sure we could come up with quite a few more. But basically, self responsibility. What you do, what you say, everything has a price.
Every action has a reaction.
Life is about balance. If we feed our computer a lot of garbage, don't think you're going to get back any information that has any value. It's the same for our lives. Knowledge We would get absolutely nowhere without knowledge. Without some kind of input, we can have no output.