There is something called Samsara. This is the feeling of cyclicality that you experience when you put Suffering and Happiness in perspective. Because Human consciousness is trapped within the mind, we are unable to oftentimes put things into perspective. And because of this, most humans are generally unaware of what's going on in their lives. They are simply acting on impulse and are rationalizing it through the higher brain.
But if you are special, you start to put things into perspective and realize the transience of live. All the experiences of your life have already been experienced by you in varying degrees in your previous lifetimes. You have fallen in love, you have hated something or someone, you've been devoted, you've been lazy ,you experienced all the emotions of life that is possible currently in your life.
At this point an individual faces the existential depression of the soul ,that was phased out through the human world and its emotions before. You start looking at the abyss and the abyss starts looking back at you ,as Nietzsche said. You start asking questions like "Why am i doing this, what's the point ,I've done this many a times before."
You can then either turn into a philosopher and end up wasting another lifetime, or you can gain a Will to Power through Yoga and actually do something about this Samsara.
Every person has the power to transcend the duality of this life and liberate Himself through the Cyclical process of reincarnation through Yoga. You can accept life as it is, and strive towards the real issue and fixing it.
The serpent is the Answer.