You may want to retain the original formatting if
- it is important for a point you are trying to make or
- changing it could alter the original meaning or confuse your audience.
Otherwise, there is usually no reason to replicate the original formatting. From The Chicago Manual of Style (14th ed.), section 10.8:
Typographical style, particularly of display type, may be changed to agree with the style of the work in which the quotation occurs. . . . Those elements of typography that are not an author's doing but the publisher's or the printer's need not, and often should not, be reproduced exactly.
The author seems to have capitalized the second line in order to emphasize it, so changing the case might alter his or her meaning. It would probably be a good idea, then, to retain the capitalization. There is no need for bold, italics, or a different font.