“You make known to me the path of life; in your presence is fullness of joy, and at your right hand are pleasures forevermore” (Psalm 16:11 ESV).
In her 2011 book, Ellen DeGeneres said, "…the key to happiness is being happy by yourself and for yourself. Happiness comes from within. You have the power to change your own mindset so that all the negative, horrible thoughts that try to invade your psyche are replaced with happy, positive, wonderful thoughts."
This advice sounds very catchy and pleasant. In some limited ways, it’s correct; we do have control over our reactions to bad circumstances. We come up against the limits of positive thinking rather quickly, however.