Zen is not JUST ceasing concepts

 Mr C:

Huangpo said all that is needed is to cease attachment and stop ruminationSkylinens Snoovatar

12:56 AM

Soh replied: 

huang po also said "It is the sudden realization that there is neither Buddha nor sentient beings, neither subject nor object.", "A perception, sudden as blinking, that subject and object are one, will lead to a deeply mysterious wordless understanding; and by this understanding will you awake to the truth of Zen.", and so on

At the time of his enlightenment, Zen Master Huangpo said, "When I hear the sound of the bell ringing, there is no bell, and also no I, only ringing-sound."

many other zen masters said likewise, such as, (excerpts from https://www.awakeningtoreality.com/2022/10/some-zen-masters-quotations-on-anatman.html )

Zen master Munan said, “There is nothing to Buddhism—just see directly, hear directly. When seeing directly, there is no seer; when hearing directly, there is no hearer.”

>Shidō Munan (至道無難, 1602-1676) was an early Tokugawa Zen master mostly active in Edo. He was the teacher of Shōju Rōjin, who is in turn considered the main teacher of Hakuin Ekaku. He is best known for the phrase that one must "die while alive," made famous by D.T. Suzuki.

….

Another Zen Master said,

'You get up in the morning, dress, wash your face, and so on; you call these miscellaneous thoughts, but all that is necessary is that there be no perceiver or perceived when you perceive—no hearer or heard when you hear, no thinker or thought when you think. Buddhism is very easy and very economical; it spares effort, but you yourself waste energy and make your own hardships.'

(Foyan Qingyuan, in Instant Zen, p 70)

so a key insight is the insight into anatman, no self, for zen enlightenment

zen is not simply a state of suspending mental concepts, it requires an awakening, a satori, a seeing into the nature of mind, empty of self and luminous

or said in another way,

"The process of eradicating avidyā (ignorance) is conceived… not as a mere stopping of thought, but as the active realization of the opposite of what ignorance misconceives. Avidyā is not a mere absence of knowledge, but a specific misconception, and it must be removed by realization of its opposite. In this vein, Tsongkhapa says that one cannot get rid of the misconception of 'inherent existence' merely by stopping conceptuality any more than one can get rid of the idea that there is a demon in a darkened cave merely by trying not to think about it. Just as one must hold a lamp and see that there is no demon there, so the illumination of wisdom is needed to clear away the darkness of ignorance." - Napper, Elizabeth, 2003, p. 103"