You can’t go back and change the beginning, but you can start where you are and change the ending.

C. S. Lewis (1898-1963) English writer, literary scholar, lay theologian [Clive Staples Lewis]

(Spurious)

Not found in Lewis' writings, and not considered authentic. There is some similarity to this Lewis quotation. More discussion here:

• (CCSLQ-41) – Go Back and Change – Essential C.S. Lewis.
• FACT CHECK: Did CS Lewis Give This Advice On Starting Over? | Check Your Fact.
• We Cannot Go Back and Start Over, But We Can Begin Now, and Make a New Ending – Quote Investigator.