From Saint John-Paul II,:
Discourse to young people in the Netherlands, May 14, 1985
Dear young people, you tell me that you often think the Church is an institution that does nothing but promulgate rules and laws… And you conclude that there is a deep discrepancy between the joy that issues from the word of Christ and the feeling of oppression that the Church’s rigidity gives you... But the gospel shows us a very demanding Christ who invites to a radical conversion of heart, detachment from earthly goods, forgiveness of sins, love of enemies, patient acceptance of persecutions and even to the sacrifice of one’s own life out of love for neighbor. Where the particular area of sexuality is concerned, we know the firm position he took in defending the indissolubility of marriage and his condemnation even as regards the simple adultery committed in the heart. And could anyone not be impressed when faced with the precept to “tear out one’s eye” or to “cut off one’s hand” when those members are an occasion of “scandal”? …
Moral licentiousness does not make people happy. Similarly, the consumer society does not bring joy of heart. The human person is only fulfilled to the extent to which that person is able to accept the demands flowing from their dignity as beings created “in the image and likeness of God” (Gen 1:27). That is why, if the Church today says things that are not agreeable, it is because it feels obligated to do so, it does so out of a duty to fidelity…
Does this mean that it isn't true the gospel message is a message of joy? On the contrary! It is absolutely true. And how is that possible? The answer can be found in one word, one single word, one short word, but its contents are as vast as the sea. And that word is love. It is perfectly possible to reconcile uncompromising precept with joy of heart. One who loves does not fear sacrifice but even seeks in sacrifice the most convincing proof of the authenticity of their love.
Source: dailygospel.org