When a loving person can do good for others, or sees that others are happy, they themselves live happily and in this way give glory to God, for “God loves a cheerful giver” (2 Cor 9:7). Our Lord especially appreciates those who find joy in the happiness of others.
If we fail how to rejoice in the well-being of others, and focus primarily on our own needs, we condemn ourselves to a joyless existence, for, as Jesus said, “It is more blessed to give than to receive” (Acts 20:35).
The family must always be a place where, when something good happens to one of its members, they know that others will be there to celebrate it with them.
Excerpt from the book AMORIS LAETITIA (THE JOY OF LOVE) by Pope Francis