Further, if Spirit has any meaning at all, then it must be eternal, or without beginning or end. If Spirit had a beginning in time, then it would be strictly temporal, it would not be timeless and eternal. And this means, as regards your own awareness, that you cannot become enlightened. You cannot attain enlightenment. If you could attain enlightenment, then that state would have a beginning in time, and so it would not be true enlightenment.

Grace and Grit: Spirituality and Healing in the Life and Death of Treya Killam Wilber (ed. Shambhala Publications, 2001) - ISBN: 9780834822320