King Charles spoke about his own experience as a cancer patient on Wednesday, during a private reception he and Queen Camilla hosted at Buckingham Palace. The royals welcomed people working in community-based cancer organizations and initiatives,

Britain’s King Charles opened up about his cancer diagnosis on Wednesday, saying it can be a “daunting” and “at times frightening” experience for those living with the illness.

The British monarch said the “frightening” experience of cancer could also illuminate the “best of humanity” as he thanked medical workers and charities.