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.

King Charles shared a touching update in his ongoing fight against cancer and what he’s learned from his diagnosis. The king wrote a message that was printed in a booklet and handed out during Buckingham Palace‘s reception for cancer charities and organizations Wednesday.

King Charles III on Wednesday opened up about the lessons he has learned from his cancer diagnosis and treatment, an experience he said "brings into sharp focus the very best of humanity."