चित्तवायव श्चित्क्रियायुताः ।शाखयोर्द्वयी शक्तिमूलका ॥
चित्तवायवः चित्क्रियायुताः शाखयोः द्वयी शक्तिमूलका
In plain words
The mind knows. The breath does. They look like two different things to deal with. They are two branches. One root, and the same sap in both. Which is why holding the breath quiets the mind — and why quieting the mind slows the breath.
Word for word
Mind and breath, joined to knowing and to doing, are two branches rooted in one power.