Not thinking about anything is Zen. Once you know this, walking, sitting, or lying down, everything you do is Zen.
Unless you see your nature, all this talk about cause & effect is nonsense. Buddhas don't practice nonsense.
Regardless of what we do, our karma has no hold on us.
You can't know your real mind as long as you deceive yourself.
Freeing oneself from words is liberation.
But people of the deepest understanding look within, distracted by nothing. Since a clear mind is the Buddha, they attain the understanding of a Buddha without using the mind.