please help me check my errors in my essay, thanks.

I have studied foreign theories for several years . Most of them are in the area of sociology and philosophy . But I felt more and more unsatisfied with those thoughts or theorys. The first reason is that all those theories can not give me much wisdom . They can hardly give me valuable instructions for my life. Sometimes when I only ready a single page or only a single sentence of the traditional book I can get a very useful enlightening feeling. Such as the Bible or the Diamond Sutural or the Confucious' books. The second reason I am not satisfied with those theorys is that most of them are controversial or confict with each other. For example some theories say that the society determines the individual but the other theory will say the opposite. Some theories say that the conflicts in the society is a kind of illness but other theories say that it can make the society (BE not needed) more united...........

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