svabhāvena balīyasā

labdhva-having gotten; nimittam-the cause; avyaktam-unseen or unknown to the person; vyakta-avyaktam-manifested and unmanifested, or the gross body and the subtle body; bhavati-come into being; uta-certainly; yatha-yoni-exactly like the mother; yatha-bijam-exactly like the father; sva-bhavena-by the natural tendency; baliyasa-which is very powerful.