坐禪三昧經 2.16

2.16

Furthermore, one is able to transform various objects. For instance, contemplating the earth element in wood and eliminating the other elements, this wood then transforms into earth. Why is this? Because wood has a portion of the earth element. Water, fire, wind, space, and treasures such as gold and silver are all like this. Why? Because wood has portions of all elements. This is the foundation of the first supernormal knowledge.