Happiness is sorrow; sorrow is happiness. There is happiness in difficulty; difficulty in happiness. Even though the ways we feel are different, they are not really different, in essence they are the same. This is the true understanding transmitted from Buddha to us.
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