It is important because the sources tell you whether the article was credible. When you have an article that has bad source, you are running the risk of having, wrong, opinionated data. This can discredit you paper if you use it.
In "Gandhi defend his beliefs" , he concludes with this sentence :
i wanted to avoid violence. Non violence is the first article of my faith. It is also the last article of my creed
From that sentence, clearly he wanted to conveyed to the people that he doesn't want to include violence in any of his movements
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