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it is the simplest things that cause the greatest change. they are often harder to achieve than the more complicated ones

Comments  

Too many pronouns. The simplest what? The more complicated what?

Also, I have to scold you. It's not really my place as an anonymous Internet spectre, but Jumpin' Jehosaphat! Do you really not know the basic rules of capitalization and punctuation? They are not optional. You have not written in English without them.