This is the explanation from Wikipedia about Mary Frye, the author of the poem Do not Stand by My Grave and Weep written in 1932.
Do not stand at my grave and weep,
I am not there; I do not sleep.
I am a thousand winds that blow,
I am the diamond glints on snow,
I am the sun on ripened grain,
I am the gentle autumn rain.
When you awaken in the morning’s hush
I am the swift uplifting rush
Of quiet birds in circling flight.
I am the soft starlight at night.
Do not stand at my grave and cry,
I am not there; I did not die.
We are all Taoists in our own ways, the beauty of Taoism; the freedom to be, to see, to feel, to think, to know, to understand and to accept our life.