HELPP!!!!!! can i write an unknown quote in a essay?

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and should i just add the quote right after the thesis statement? also i wanna know before adding a quote what should i write? like say, as the saying goes and write the quote? or just write it right away?   

May 1st, 2015

the best way to write a quote would be a brief statement to signify that you acknowledge the original  writers work. Quick statements like; ...as xxx put it, ...in the words of xxx, should serve the role. insert a quote immediately before writing the quoted words, then close immediately the direct quote is penned down.

May 1st, 2015

but i don't know who wrote the quote, so can i just go like "......" unknown? 

May 1st, 2015

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