The Compendium of Caraka 4.3.9

4.3.9

na khalu garbhasya na ca māturna piturna cātmanaḥ sarvabhāveṣu yatheṣṭakāritvamasti; te kiṃcit svavaśāt kurvanti, kiṃcit karmavaśāt, kvaciccaiṣāṃ karaṇaśaktirbhavati, kvacinna bhavati/

Indeed, neither the embryo, nor the mother, nor the father, nor the self has the power to act completely as desired with regard to all factors; they do some things through their own control, some things through the power of karma, and somewhere their instrumental capacity exists, somewhere it does not exist.