end in itself

end in itself idiom
A purpose or goal desired for its own sake (rather than to attain something else). For example, For me, writing books is an end in itself; they don't really make that much money. This expression employs the noun end in the sense of “final cause or purpose,” a usage dating from the early 1500s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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