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Wa Kei Sei Jaku
和, 敬, 清, 寂 or Wa, Kei, Sei, Jaku are the principles of the way of tea or 茶道.
The meanings are:
Harmony 和 (wa).
Respect 敬 (kei).
Purity 清 (sei).
Tranquility 寂 (jaku).
These principles or tenets were created by tea master Sen Rikyu (1522-1591). More about these ideas: Chanoyu
See Also: The Way of Tea