Whether time goes quickly or slowly is
all in the mind, just as the size of things
is in the mind's eye. A single day for
the person who knows leisure lasts ten
thousand ages, and a tiny room for the
broad-minded is really several chambers.

Vegetable Roots Discourse: Wisdom from Ming China on Life and Living - Caicentan by Hong Zicheng (Shoemaker & Hoard, 2006), Translated by Robert Aitken with Daniel W. Y. Kwok, p. 111