What is the relationship between China's calligraphy and painting?

Chinese painting and calligraphy belong to the treasures of China art, and they are interrelated, but painting can not be separated from characters, and calligraphy and painting are of the same origin. Personally, I think that a master of Chinese painting must also be a master of calligraphy, otherwise it is not systematic. For example, Pan Tianshou, Qi Baishi and Wu Changshuo are all painters and painters. It can be said that calligraphy lays the foundation for painting, and painting will bring inspiration to calligraphy. This is the charm of the connection between the two.