Source: Life, the Truth, and Being Free (2010), p. 42
Context: How would your life be different if … You stopped worrying about things you can't control and started focusing on the things you can? Let today be the day … You free yourself from fruitless worry, seize the day and take effective action on things you can change.
“Things can change in a day.”
Source: The God of Small Things
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Arundhati Roy 122
Indian novelist, essayist 1961Related quotes

“Every day things change, but basically they stay the same.”
Seek Up
Remember Two Things (1993)

“Different time, different place,” I said. “Things can change. People can change.”
Source: The Golden Lily

One of the most commonly quoted forms.
The Serenity Prayer (c. 1942)
Variant: Lord, grant me the strength to accept the things I cannot change,
he courage to change the things I can,
and the wisdom to know the difference.

Widely known as The Serenity Prayer this has often been attributed to St. Francis, but earliest known forms of it appeared in the early 20th century, and it is generally credited to Reinhold Niebuhr.
Misattributed