In the age of imitation, many outwardly follow along with things and inwardly fail to clarify their minds. Even if they do great works, they are not ultimate. In general, it is the baseness and vulgarity of the people with whom they associate that makes them that way.
It is like the case of insects: if they gather on an ox, they do not fly more than a few paces, but if they stick to a swift horse, they can chase the wind and pursue the sun, simply because of the superiority of what they cleave to.
From Zen Lessons, translated by Thomas Cleary, pages 38–39