As you may know, the concept of Japanese tea ceremony is strongly related to Zen Buddhism. There are lots of expressions linked with Zen Buddhism, particularly associated with the Japanese tea ceremony.
For example,
Ichi-go ichi-e
“Treasure every meeting, for it will never recur.” The day will never come again. The time will never come around. The expression reminds guests that each tea gathering is very special in the context of tea ceremony.
Wa-Kei-Sei-Jaku
“Harmony, respect, purity and tranquility.” The concept of the simple 4-word is seen not only for tea ceremony, but most of the traditional Japanese culture. This is the time-honored Japanese soul and spirit
Ryuryoku-Kako
“Willow is always green, flowers are always crimson.“ This line signifies natural, genuine and pure. Everything in this world has its own form, color and aroma. Value and appreciate its own special quality as it is.
Ko-Un-Ryu-Sui
It literally means "cloud goes and goes and water flows and flows". It implies 'freedom' such as clouds and water. It preaches that lead oneself according to circumstances.
