यन्मूलं सर्वभूतानां यन्मूलं चित्तबन्धनम् ।मूलबन्धः सदा सेव्यो योग्योऽसौ राजयोगिनाम् ॥ ११४ ॥
In plain words
What is the root of every being, and the root of the mind's own stillness — that is mūlabandha, the root-lock. Keep to it always. For those on the path of rāja-yoga, this is the practice that fits.
Close to the Sanskrit
That which is the root of all beings, that which is the root of the binding of the mind — that mūlabandha is always to be practiced; this one is fit for rāja-yogins.