The mind is the Buddha, and the Buddha is the mind.
The mind is always present. You just don't see it.
Not thinking about anything is Zen. Once you know this, walking, sitting, or lying down, everything you do is Zen.
Buddhas move freely through birth and death, appearing and disappearing at will.
People who don't see their own nature and imagine they can practice thoughtlessness all the time are liars and fools.
Regardless of what we do, our karma has no hold on us.