Depending on where you live in these troubled times you might need a certificate of vaccination ID which some have called COVID. However, with Zen, a paper certification of enlightenment is not required.
What is required is kenshō which means direct insight into our true nature. It is a special kind of intuition. I hasten to add that much of the literature of Zen, which includes koans, makes it almost impossible to understand Zen without kenshō.
Still, all of us believe in the beginning that a study of Zen's literature will take us to kenshō. But how does Zen dissuade such people? The short answer is it doesn’t. Such people have to find out the hard way.
There is no easy path to Zen because the person on its path is usually a wily and deceptive creature! Much of Zen is designed to thwart their ambitions (in old China Chan/Zen was very popular, it was the literati who claimed to understand Chan).
Today, a typical Zen Center is more like a gathering of victims and other dysfunctional types—a tad short of Marx’s lumpenproletariat. They attend because it is the appearance of Zen that attracts them; not the reality of Zen which demands a deep journey into one's psyche.
If one is lucky, more and more they will find that Zen’s intrapersonal path can be very difficult to stay on. To resurrect our lost intuition, which is what Zen is really about, as far as training goes it aims to rid us of our dependency on letters and words going to the very heart of Zen. Here spirit transcends letters and words. Giving up his dependency is no easy task, few accomplish it.