“Excellence/Perfection is not a destination; it is a continuous journey that never ends.”
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Oprah Winfrey 143
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“It is good to have an end to journey towards; but it is the journey that matters, in the end.”
Source: Hainish Cycle, The Left Hand of Darkness (1969), Chapter 15 “To the Ice” (p. 220)

“It is good to have an end to journey towards; but it is the journey that matters, in the end.”
The Left Hand of Darkness (1969) by Ursula K. Le Guin, in Chapter 15 "To the Ice"
See also https://www.huffpost.com/entry/hemingways-stolen-quotati_b_6868994.
Misattributed
Variant: It is good to have an end to a journey, but it is the journey that matters, in the end.

Commitment to Christianizing the family is a journey that should never end http://fides.org/en/news/27458-ASIA_TAIWAN_Commitment_to_Christianizing_the_family_is_a_journey_that_should_never_end (21 September 2010)

“There is only one journey. Going inside yourself.”

“Journeys end in lovers meeting.”
Variant: Journeys end in lovers meeting,
Every wise man's son doth know.
Source: Twelfth Night
“You'll never share real love until you love yourself.”
Rent (1996)