Surely, we should have a turning point in life. Once you have your best day in life, next you will have the worst day ever. You may feel extremely happy some times, but sooner or later you'll be at your lowest point. Yeah, there's no such immortal things. We must prepare for the worst time while, at the same time, hope for the best.
One day you hate somethings, the next day you love them. One day you get mad of things, the other day you feel like dying without it. Nobody knows when will they have the turning point. Just to prepare for it, because that is one of God's secret, imo.
Life. A word that has so many things to hide. A word that make us do all these struggle. And turning point is just one of life's phase, face it.