"...But if we have already got really used to zazen, then no matter if we work or sit in zazen, our state of mind won't be moved around so easily anymore. When we refer to this state, we say 'the place of practice is limitless.' We hardly see any difference between moving, working, and sitting in silence. Such is the calm mind. With such mind, we gain a broader perspective, a perspective on our environment. This is one of the most important things in zazen.
Therefore, we seek not only our own happiness, instead calmly looking at the circumstances surrounding us, we regard our environment as our companion, and we are able to maintain a calm and peaceful state. Zazen means developing this kind of humanity. Seeking only our own happiness is not zazen.
Putting the mind in order in a way whereby it becomes the foundation of our whole life: that is zazen..."
--Taigen Shodo Harada Roshi