Pope Francis says in his book Happiness in this Life that when celibate priests and sisters are dissatisfied with their lives there is no joy. They are sad.
Joy, he says, comes when they are fathers and mothers to their communities.
And the reason for this is when, as a single person, you are cut off from others, you are cut off from love.
Your heart is dead. And you are sad.
When you are a father or a mother to others love flows through you.
Your heart is alive.
And joy flows from this.
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