Gaudete in Domino is an apostolic exhortation issued by Pope Paul VI in 1975 on Christian joy.
“Technological society has succeeded in multiplying the opportunities for pleasure, but it has great difficulty in generating joy.” (source)
“the desire to find within it his fulfillment and happiness” (source)
“For the problem seems to be, above all, of the spiritual order.” (source)
“instinctively oriented towards Him as its sole and supreme good” (source)