Dear Friends With respect, this essay has a few very tricky ideas, the concept of nothingness in particular. This essay reflects clever intellectual gymnastics more than mature internal experience. With respect, when investigating a subject as subtle as meditation, one should reference a yogi deeply steeped in the practice. The yogi knows the science of meditation and speaks very carfully, all the rest is merely pleasant coffee house philosophy. Works written by Swami Sivananda, Swami Yogananda (SRF) , Swami Rama, Ajahn Chah, Ajahn Sumedho (the short list) are of great value.
To make it easier I'll list some current meditation texts of value:
Yoga Psychology: A Practical Guide to Meditation By Swami Ajaya, Ph.D
The Theory and Practice of Meditation Edited By Rudolph M Ballentine M.D.
Happiness By Matthieu Ricard
Why Meditate? By Matthieu Ricard
Seeking The Heart of Wisdom: The path of insight meditation By J Kornfield & J. Goldstein
A good start with correct knowlege will give you success