A triumph of soul and character
There is no exact definition of the word happiness. Happy people are happy for all sorts of reasons. The key is not wealth or physical well-being, since we find beggars, invalids and so-called failures, who are extremely happy.
Being happy is a sort of unexpected dividend. But staying happy is an accomplishment, a triumph of soul and character. It is not selfish to strive for it. It is, indeed, a duty to us and others.
In fact, we should learn to how to find the happiness. Just like the marked deck of cards, we should do what we want to do, and make everything in your control. Some customers said to me: every time when they use the marked playing cards, and wear the sunglasses contact lenses, they just are afraid that the others will have a suspect for their sunglasses and see the invisible ink on the back of cards with naked eyes. In fact, when you use our high quality marked deck of cards, it is needless for you to worry about that.