Some say that happiness is not good for mortals, & they ought to be answered that sorrow is not fit for immortals & is utterly useless to any one; a blight never does good to a tree, & if a blight kill not a tree but it still bear fruit, let none say that the fruit was in consequence of the blight.
Join with those who sing songs, tell stories, enjoy life ... because happiness is contagious. Join those who walk with their heads high even when they have tears in their eyes. Avoid those who ... have never shed a tear
When you have read the Bible, you will know it is the word of God, because you will have found it the key to your own heart, your own happiness and your own duty.
It must not be supposed that happiness will demand many or great possessions; for self-sufficiency does not depend on excessive abundance, nor does moral conduct, and it is possible to perform noble deeds even without being ruler of land and sea: one can do virtuous acts with quite moderate resources. This may be clearly observed in experience: private citizens do not seem to be less but more given to doing virtuous actions than princes and potentates. It is sufficient then if moderate resources are forthcoming; for a life of virtuous activity will be essentially a happy life.
The secret is here in the present. If you pay attention to the present, you can improve upon it. And, if you improve on the present, what comes later will also be better." -- The Alchemist
What you focus on expands, and when you focus on the goodness in your life, you create more of it. Opportunities, relationships, even money flowed my way when I learned to be grateful no matter what happened in my life.