Barefooted and naked of breast,
I mingle with the people of the world.
My clothes are ragged and dust-laden,
and I am ever blissful.
I use no magic to extend my life;
Now, before me, the dead trees
Here is an enlightened person. Bare of self adornments and pretensions. There is only the wholesome outflowings of an enlightened mind.
The dead trees become alive refers to two things
1. There is a Ch'an/Zen saying 'The flower blossoms on the withered branch'. It means that when our negativities have completely withered then our Buddha-nature blossoms, and
2. It is the activity of the enlightened person to awaken the unenlightened.