Capitalize the first word in a sentence that is a direct quote
When quoting, the first word of a complete sentence should be capitalized, regardless of its placement within the main sentence.
We know that capitalization is reserved for the beginnings of sentences, so when we see a capital letter mid-sentence, it might seem like a mistake. When using quotations, though, capitalization in mid-sentence is common. More specifically, when quotations form complete sentences, they must be capitalized no matter where they appear in the main sentence. All of the sentences below are correct, for example:
Don’t capitalize quotes that are partial sentences
Quotations within a sentence aren’t always capitalized, however. When the quote is a piece of a bigger quote or a sentence fragment, no capitalization is necessary. Consider the sentences below, and note the lack of capitalization in quotes within these sentences: