The world is a contrast
Our world consists of a great number of different kinds of the polarities. Just think about any fact that will be the first one to come to your mind. No matter on the kind of the fact or the object you will think about it will, no doubt, has the polarity. Say, you like something, anything, there, for sure, will be something that is considered to be the polarity for the thing you like. If you are fond of the classic music there will be someone who is fond of the death-rock music, which is the polarity for the classic music.
There are men and women the humanity divided into, and those two kinds of the people are the true polarities. Men and women are totally different personalities. Men are stern, strong, and wordless and they always know what they want and what they have to do to get what they want. Women are, in counter, tender, delicate and sharply percept everything that is going on around them. Women are easy to hurt and they need the permanent defence and that defence is provided by men. So, there is no way for those two polarities to live without each other as they supplement each other and create a harmony.
There are other polarities that we see every day in our life; those polarities are night and day. From the very beginning of the existence of the Earth those polarities follows each other day after day, or it is better to say night by night, or even better to say day by night, night by day. Those are the common phenomena and no one wonders about them, no one wonders why the night is followed by day and the day is followed by night. That is how it was, that is how it is and that is how it will be. No matter that those are rather common phenomena those are still rather interesting. Night is a polarity for day, and the day is a polarity for night. There is no night without day and there is no day without night.
There is a light and darkness. Those are also the polarities for each other. Those never occur at the same time, where the darkness is there will never be the light and where the light is there will never be the darkness. The second one is rather pleasant phenomenon and every one adores the light, but the first one is rather dull and mysterious and most people get scared with the darkness. But, just think about, is it possible for light to exist without darkness, or for darkness to exist without light? No it is not. It is not possible for one of those to exist without another, as if there is no light a man will never realise that the darkness fell and if there is no darkness a man will never realise that the light has come.
And that is how everything in our life is managed. There is a good side and the bad side. Though people always prefer the good side, they do realise that there is no good without evil. We would never get happy with the day but for the night, we would never feel the release but for the sufferings, we would never see the light but for the darkness and we would never hate but for the love.