Princess Kate urged the letter's recipients to consider “the importance of love, empathy and how much we need one another.”

Christmas may be a time for celebration, but this year, for Kate Middleton, it's also a moment to reflect. On Saturday, the Princess of Wales penned a poignant holiday message to the 1,600 guests of her annual "Together at Christmas" carol concert following a difficult year that saw her undergo chemotherapy treatment after a devastating cancer diagnosis .