By necessity, by proclivity, and by delight, we all quote. In fact it is as difficult to appropriate the thoughts of others as it is to invent.
Source: Letters and Social Aims.
-- Ralph Waldo Emerson, (May 25 1803-1882), US philosopher, poet, essayist; He was the main spokesman of his time for moral optimism and belief in the individual: Self-Reliance, 1844.