Ashtangahridayasamhita 3111

3111

śanaiḥ śanaiś copaśayād gūḍhām api muhur muhuḥ |
viśeṣāj jīvitaṃ prāṇa udāno balam ucyate || 56 ||

and gradually, repeatedly from therapeutic tests, even when it is hidden. / Especially, prāṇa is said to be life, and udāna strength;