He quit work on Friday, but on Monday he had a change of heart and decided to come back.

We can go out driving on Slow Hand Row / We could stay inside and play games, I don't know / And you could have a change of heart

"I thought you were loyal to the cause, Paul."
“I was,” Grayson answered. “Then I saw the kind of people who share your vision, and I had a change of heart.”

The Keswick-Carlisle, Bury-Rawtenstall, Watford-Croxley Green and Haltwhistle-Alston services had run out of friends, but the hit-listed Oldham-Rochdale and Inverness-Kyle of Lochalsh lines would benefit from a change of heart.

Change of heart

Meaning

Noun