From nature

A mountain loses its spirit without cloud, loses its peculiarity without stones, loses its elegance without trees, and loses its life without water, and in painting, one should concentrate the mind, and hold the breath, with concentration of the mind, serenity is maintained, with the breath held up, preciseness is attained. 

One should be as serene as an old monk in meditation and be as precise as a silk worm in spitting silk.

The spirit and real fun of painting are from nature and beyond brushes and paints.