"The only time you should ever look back is to see how far you’ve come” is a saying that has been printed on many posters.

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Keith Carlisle Smith
‏@KeithCarlisle
you know the phrase “don’t look back”? i think it’s important to look back sometimes, just to see how far you’ve come.
7:22 PM - 29 Aug 09

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Daniela Hoeche
‏@Just_Dani
RT @Agilesmusic: sometimes in life you gotta look back to see how far you’ve come… I must say i’ve come a (cont) http://tl.gd/187uhn
1:49 AM - 11 May 10

,a href="https://twitter.com/hesyra/status/20536312646">Twitter
Hesy Ra
‏@hesyra
Sometimes you have to look back to see how far you’ve come. An article in Bloomberg Businessweek—-- http://url4.eu/6muhe
2:53 AM - 7 Aug 10

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OSWALD
‏@itsfrankybaby
You only should look back to see how far you’ve come.
2:04 PM - 1 Oct 10

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Life is good
‏@Lifeisgood
When the road ahead seems too long, look back to see how far you’ve come. http://tinyurl.com/3nscz4b #progress
7:54 AM - 24 Aug 11