To be happy is short lived always being replaced with becoming sad. These two are emotions that swing from one to another. The only thing that is eternal is JOY, which flows out of our relationship with God.
I sometimes wonder whether all pleasures are not substitutes for joy. -C.S. Lewis
Be joyful always; pray continually; give thanks in all circumstances, for this is God’s will for you… NIV
Consider it pure joy, my brothers, whenever you face trials of many kinds, because you know that the testing of your faith develops perseverance. Perseverance must finish its work so that you may be mature and complete, not lacking anything. NIV
Though you have not seen him, you love him; and even though you do not see him now, you believe in him and are filled with an inexpressible and glorious joy…NIV