"I guess I'll always love you...
I guess I'll always care.
I guess I'll always love you...
I guess I'll always care." 
"I Guess I'll Always Love You" (song, duet) 
Gilbert O'Sullivan,  "I Guess I'll Always Love You" https://www.youtube.com/watch?v=RSK7VHZsiiQ (song on YouTube) 
Song lyrics
                                    
“I guess I always felt even if the world came to an end, McDonald's would still be open.”
Source: Life As We Knew It
Help us to complete the source, original and additional information
Susan Beth Pfeffer 28
American writer 1948Related quotes
“Even if I knew that tomorrow the world would go to pieces, I would still plant my apple tree.”
                                        
                                        Earliest record is in a circular letter from Hessian Church minister Karl Lotz on 5 October 1944 and modified from a quote by Johanan ben Zakai according to [Landes, Richard Allen, Heaven on Earth: The varieties of the millennial experience, USA, Oxford University Press, 2011, 978-0-19-975359-8, https://books.google.com/books?id=seS-0JTykgoC&pg=PA48, 48]
Ref: en.wikiquote.org - Martin Luther / Disputed 
Misattributed
                                    
“Even if I knew that tomorrow the world would go to pieces, I would still plant my apple tree.”
                                        
                                        Martin Luther 
Misattributed
                                    
                                        
                                        "Technology Is The Target", point 2 
Hit Where It Hurts (2002)
                                    
                                        
                                         Trump's interview with David Brody http://www1.cbn.com/cbnnews/entertainment/2017/january/worship-artist-credits-psalms-91-for-miraculous-cancer-healing, CBN News (29 January 2017) 
2010s, 2017, January
                                    
Source: The Story of My Life (1932), Ch. 4 "Called To The Bar"
“I guess I never felt I had an effect on people until I was in Korea.”
As quoted in Marilyn: a biography (1973) by Norman Mailer p. 21