Should I use a comma or a colon when introducing a block quotation?
The choice of a comma or colon depends on the structure of the sentence. If the block quotation continues the introductory sentence, a comma is likely the best choice, and the first word of the quotation shouldn't be capitalized unless it's a proper noun. If, however, the quotation is an independent clause that serves as an example or illustration of the introductory sentence, a colon is a better choice, and the first word of the quotation should be capitalized. For more information on how to use commas and colons, please see the presentation titled "Punctuating sentences: Commas, semicolons, and colons" in Punctuation. For examples of block quotations that provide information on when to use commas or colons, as well as when to capitalize the first word of a block quotation, please see "Block Quotation Examples".