Mary Oliver says it in her poem "The Buddha's Last Instruction"
Make of yourself a light said the Buddha, before he died...
And in "When I Am Among the Trees" she writes:
The light flows from their branches.
And they call again, "It's simple," they say,
"and you too have come
into the world to do this, to go easy, to be filled
with light, and to shine.
Just think what the world would be like if we did this!
Peace on Earth ~ Goodwill toward All ~ Merry Christmas!