TantraS, 6, 5.1 tatra yady api dehe sabāhyābhyantaram otaprotarūpaḥ prāṇaḥ tathāpi prasphuṭasaṃvedyaprayatnaḥ asau hṛdayāt prabhṛti iti tata eva ayaṃ nirūpaṇīyaḥ //

TantraS, 12, 8.0 punar api bāhyābhyantaratayā dvitvam bahir upāsyamantratādātmyena tanmayīkṛte tatra tatra nimajjanam ity uktam //