“Enjoyment is always bound up with gratitude; if this gratitude is deeply felt it includes the wish to return goodness received and is thus the basis of generosity. There is always a close connection between being able to accept and to give, and both are part of the relation to the good object and therefore counteract loneliness. Furthermore, the feeling of generosity underlies creativeness, and this applies to the infant's most primitive constructive activities as well as to the creativeness of the adult.
The capacity for enjoyment is also the precondition for a measure of resignation which allows for pleasure in what is available without too much greed for inaccessible gratifications and without excessive resentment about frustration. Such adaptation can already be observed in some young infants. Resignation is bound up with tolerance and with the feeling that destructive impulses will not overwhelm love, and that therefore goodness and life may be preserved.”
― Melanie Klein, Envy And Gratitude And Other Works 1946-1963