Not thinking about anything is Zen.
Once you know this, walking, sitting, or lying down;
Everything you do is Zen.
Not-knowing most closely approaches the Truth.
How can I show you Zen unless you first empty your cup?
The most important thing is always to keep your beginner's mind. There is no need to have a deep understanding of Zen. Even though you read much Zen literature, you must read each sentence with a fresh mind. You should not say, "I know what Zen is," or "I have attained enlightenment." This is also the real secret of the arts: always be a beginner.
~ Shunryu Suzuki-roshi
If you have any image of what the Truth is, slay it immediately because that's not It. We must leave the entire collection of conditioned thought behind and let ourselves be led by the inner thread of silence into the unknown, beyond where all paths end, to that place where we go innocently or not at all, not once but continually.