“If you can see, look. If you can look, observe.”

Appears in Churchill By Himself, ed. Langworth, PublicAffairs , p. 576 (“Appendix I : Red Herrings”) : ISBN 1586489577 , with the following explanatory note ; "Reported by the usually reliable Graham Cawthorne, but not in Hansard; possibly an aside to a colleague, however"
Disputed

In Churchill by Himself (2008), Appendix I: Red Herrings, ed. Langworth, PublicAffairs, p. 577 ISBN 1586486381; “Commonly ascribed to WSC, even by The Queen (Christmas Message, 1999). What Churchill actually said was ‘The longer you can look back, the farther you can look forward’”.
The attribution of the mistaken form of the quote to Churchill dates from at least 1959 https://books.google.com/books?id=QN3hAAAAMAAJ&dq=The+farther+backward+you+look%2C+the+further+forward+you+can+see&focus=searchwithinvolume&q=%22backward+you+can+look%22.
Misattributed

Source: God: The Failed Hypothesis (2007), Chapter 4: 'Cosmic Evidence', p.128-129
Context: We have yet to encounter an observable astronomical phenomenon that requires a supernatural element to be added to a model in order to describe the event... Observations in cosmology look just as they can be expected to look if there is no God.

Source: The Secret Garden

"Alive", p. 51
Laboratories of the Spirit (1975)
Context: It is alive. It is you,
God. Looking out I can see
no death. The earth moves, the
sea moves, the wind goes
on its exuberant
journeys. Many creatures
reflect you, the flowers
your color, the tides the precision
of your calculations. There
is nothing too ample
for you to overflow, nothing
so small that your workmanship
is not revealed.

D.E. Butler and Anthony King, "The British General Election of 1964", p. 147.
Remark frequently made during the 1964 general election campaign.
Prime Minister

Letter to his brother Jeff, from Hawaii (22 March 1942); p. 17
To Reach Eternity (1989)

Malakar as Bill Vendall, 25 year old graduate student of fine arts, on his ever-changing 'character creation', Sanjaya Malakar. http://www.funnyordie.com/videos/4763