Quotations have a way of insinuating themselves into our moral framework and our perceptions. They augment our values, challenge our assumptions, edify our convictions; and yes sometimes they also taunt our inflexibility, ridicule our conceptions, insult our intelligence.
Quotations are the encapsulated wisdom, or imprudence, of our collective understanding. For writers, these are the secret treasures the pirates hid. Use and enjoy.