In plain words
Though there is going and coming, I am not the one who went, nor the one who came. Looked into, there is no going or coming at all. I have never been sunk in the qualities that nature's changes produce, and I am not sunk in them now.
Word for word
Though going and coming occur, I am not the one who goes or comes. On investigation I have no going or coming; I have not been and am not immersed in the properties arising from nature's changes.