Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 104.
“Love of God is pure when joy and suffering inspire an equal degree of gratitude.”
Source: Gravity and Grace
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Simone Weil 193
French philosopher, Christian mystic, and social activist 1909–1943Related quotes
“Joy is the simplest form of gratitude.”
As quoted in Finding the Magnificent in Lower Mundane : Extraordinary Stories About An Ordinary Place (1994) by Bob Stromberg, p. 69.
“Gratitude, not understanding, is the secret to joy and equanimity.”
Reverence for Life (1969)
“Gratitude is a sickness suffered by dogs.”
                                        
                                        As quoted in The Memoirs of Stalin's former secretary (1992) by Boris Bazhanov [Saint Petersburg]  (in Russian) http://lib.ru/MEMUARY/BAZHANOW/stalin.txt 
Contemporary witnesses
                                    
Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 86
                                
                                    “The pure memories given
To help our joy on earth, when earth is past,
Shall help our joy in heaven.”
                                
                                
                                
                                
                            
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 407.