Happiness and joy are two different things. Happiness is on a physical level and joy is on a spiritual level. Though we can try to be happy, and that`s alright, life DOES effect our happiness. The Bible says that the Christians were hated, tormented, destitute, etc.; they had sorrow. Things in life can give us happiness, but they are temporal. This can cause us to lose our happiness. But joy is a spiritual thing. We have joy because we`ve been born again. The truth of our salvation, and our hope in Jesus gives us joy. Notice that joy is one of the fruits of the Spirit, not happiness. We were never promised happiness, but we ARE promised joy. Happiness comes and goes, but joy is eternal. The joy of the LORD is our strength. Things in life do effect our happiness, we can`t always be happy; but we can always have joy.