We ask of life to run smoothly, that things be easy, but when it's easy we become bored. To escape boredom we fall into addictions or we create troubles or problems for ourselves so as to compensate for or rather to eradicate the boredom. Then we complain about our addictions, troubles and problems.
When life is no longer easy, we are no longer bored; but nor is it easy to say we are happy.
Peace of mind: why are you so difficult to achieve?