“You cannot change your past, only the way you think and feel about it. When you look back, is there anything you remember that troubles or upsets you? Do you regret missed opportunities, failed relationships or people that you hurt? Do you feel guilt over things you did wrong and poor decisions made, or anxiety over what people did or said to you?”

This is a very close paraphrase of a quotation attributed to Carl Buehner in a book published many years earlier - “They may forget what you said — but they will never forget how you made them feel.” quoted in Richard Evans' Quote Book, 1971, Publisher's Press, ASIN: B000TV5WBW, although it is widely (mis)attributed to Angelou in her book Worth Repeating: More Than 5,000 Classic and Contemporary Quotes (2003) by Bob Kelly, p. 263,
Misattributed
Variant: People will forget what you said. People will forget what you did. But people will never forget how you made them feel.

Source: The 7 Habits of Highly Effective Teens: The Ultimate Teenage Success Guide

Source: Inferno

Source: It's Not Summer Without You

Source: City of Glass

Source: Oranges Are Not the Only Fruit

Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), Successful Recruitment in a Week (2012) https://books.google.ae/books?idp24GkAsgjGEC&printsecfrontcover&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIGjAA#vonepage&qnigel%20cumberland&ffalse, 100 Things Successful People Do: Little Exercises for Successful Living (2016) https://books.google.ae/books?idnu0lCwAAQBAJ&dqnigel+cumberland&hlen&saX&ved0ahUKEwjF75Xw0IHNAhULLcAKHazACBMQ6AEIMjAE