Life is Zen by Zen Master Seung Sahn

Life is Zen. But some people say that life is suffering. How are these different? If you make “my life is Zen,” then your life becomes Zen. If somebody else makes “my life is suffering,” then that person’s life becomes suffering. So it all depends on how you are keeping your mind just now, at this very moment! This just-now mind continues and becomes your life, as one point continues and becomes a straight line.

If you attain enlightenment, you will understand that all people are suffering greatly, so your mind also will be suffering. This is big suffering. So you must enter the great bodhisattva way and save all people from their suffering.