Sanskrit: यन्मूलं सर्वभूतानां यन्मूलं चित्तबन्धनम्।  मूलबन्धः सदा सेव्यो योगोऽसौ राजयोगिनाम्।   
English:  That (Brahman) which is the root of all existence and on which the restraint of the mind is based is called the restraining root (Mulabandha) which should always be adopted since it is fit for Raja-yogins.