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                                        "Upside Down". 
Songs
                                    
Source: You Know You Love Me
“I found the secret to life; I'm okay when everything is not okay”
                                        
                                        "Upside Down". 
Songs
                                    
“Everything will be okay in the end. If it's not okay, it's not the end.”
                                        
                                        Also found with the alternative spelling: Everything is okay in the end.  If it's not okay, it's not the end
Found anonymously on Usenet in  2000 https://groups.google.com/forum/message/raw?msg=alt.support.divorce/gKiyfcAYreo/jjuc6KTu_NAJ.  First known attribution to Lennon is from  2011 https://groups.google.com/forum/message/raw?msg=stow-ma-apple-barn/45MNk9KiGsY/vaq6pr8hgI0J. 
Disputed 
Variant: Everything is OK in the end. If it's not OK, it's not the end.
                                    
                                
                                    “Why you gotta act like you know, if you don't know?
It's okay if you don't know everything.”
                                
                                
                                
                                
                            
                                        
                                        "Bastard", "Songs for Silverman" (2005). 
Song lyrics, Solo
                                    
“Everything really is going to be okay. (And if not okay, then at least comic.)”
Source: Eat, Pray, Love
 
                            
                        
                        
                         
                            
                        
                        
                        