Straight and tactful

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I like to chat with friends. Before I say something I can think of it. But I can not think more. So sometimes I often say something wrong. My friend often remind me that I shoud think more about it before I speak it. I know it is not good, I try to do not speak mistake words. Because some of thme may misunderstand me and feel bad. My frind say that you do not speak very straightly, you should speak tactfully. How about you?