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3 sips: the first for the eyes, the second for the taste, the third to feel the soul the host has put into it (apart from powdered tea and water, he only adds his soul).
ふまい まつだいら: A mistake of the host is actually a mistake of the guest and vice-versa. The story of
利休 visiting ちくあん, who was so excited he was trembling, comes to mind.