Did I deny that the state of mind is not important? As long as you maintain your positive mindset, you can maintain it, and I already said it in my post. The picture you drew here is the thing that you think of as happiness. I don't expect too much from life like you, and according to you, the variable you mentioned here is uncertainty. You can also die, does it mean we can't be happy? A positive mindset knows how to eliminate the thoughts of uncertainty, as it's something beyond control, and allows the person to find happiness. If you worry too much about the uncertainty, happiness is not for you.