Zazen practice and everyday activity are one thing. We call zazen everyday life, and everyday life zazen.
Shunryu SuzukiWhen you are practicing zazen, do not try to stop your thinking. Let it stop by itself. If something comes into your mind, let it come in, and let it go out. It will not stay long. When you try to stop your thinking, it means you are bothered by it. Do not be bothered by anything. It appears as if something comes from outside your mind, but actually it is only the waves of your mind, and if you are not bothered by the waves, gradually they will become calmer and calmer.
Shunryu SuzukiThe mind we have when we practice zazen is the great mind: we don't try to see anything; we stop conceptual thinking; we stop emotional activity; we just sit. Whatever happens to us, we are not bothered. We just sit. It is like something happening in the great sky. Whatever kind of bird flies through it, the sky doesn't care. That is the mind transmitted from Buddha to us.
Shunryu Suzuki