Everything in the world is created, changed, and destroyed by the truth(Natural Law). The truth is the law of cause and effect. That is, given causes produce the corresponding effect. In fact, there is no need to call it a law. Simply the things that exist in the world (causes) create other things (effects).
If there are things (effects) we want in our life, we can achieve them by creating the corresponding things (causes). The problem is that these things include good and bad, right and wrong. Of course, it would be most desirable to set a good result and create reasonable causes in the right way to achieve it. But this is really difficult and hard. You cannot see whether what you want is good or bad, and whether the way you create the proper causes for what you want is right or wrong, unless you can see things of the world for yourself, or learn how to see.