Forked Tongues

The Chinese writer Lin Yutang, who I believed was based in the USA at the time, quotes the following in his book The Importance of Living from "Ch'asu, an excellent treatise on tea". I have no idea who wrote this or indeed if it is even a real book, rather than something Lin Yutang made up himself; do let me know if you've heard of it and know where the original may be found.

Proper moments for drinking tea:

When one's heart and hands are idle.
Tired after reading poetry.
When one's thoughts are disturbed.
( continued under the cut )