tasya prajñā pratiṣṭhitā

tani-those senses; sarvani-all; samyamya-keeping under control; yuktah-being engaged; asita-being so situated; mat-parah-in relationship with Me; vase-in full subjugation; hi-certainly; yasya-one whose; indriyani-senses; tasya-his; prajna-consciousness; pratisthita-fixed.