I tell the students never to leave a "naked" quote in their writing. They must include an indication of the quote's significance or, "dress" the quote. The best way to do this is to quote less than a whole sentence. I'll give you an example I use. It's from a literary essay (Rip Van Winkle), but I think it shows the point.
NAKED: Rip comes home to a different town. "Rip looked and beheld a precise counterpart of himself as he went up the mountain, apparently as lazy and certainly as ragged." He doesn't know what to think of all the changes.
MEDIOCRE: "Rip looked and beheld a precise counterpart of himself as he went up the mountain, apparently as lazy and certainly as ragged." He cannot understand that this is his son, now grown.
SKILLED: When Rip sees his son, who is "a precise counterpart of himself as he went up the mountain," his confusion mounts.
NAKED: Rip comes home to a different town. "Rip looked and beheld a precise counterpart of himself as he went up the mountain, apparently as lazy and certainly as ragged." He doesn't know what to think of all the changes.
MEDIOCRE: "Rip looked and beheld a precise counterpart of himself as he went up the mountain, apparently as lazy and certainly as ragged." He cannot understand that this is his son, now grown.
SKILLED: When Rip sees his son, who is "a precise counterpart of himself as he went up the mountain," his confusion mounts.