   As described, many of the internal senses, particularly the extended activities of estimation and the cogitative faculty, perform in ways that encroach upon the preserve of the rational faculty and threaten to compromise its objectivity and separate, immaterial nature, damaging the soul in its quest for immortal bliss. Consequently, in his later writings Avicenna distanced intuition from any physical base within estimation and the brain, locating it amorphously in the soul as a divine emanation; and he limited the internal faculty of cogitation to thinking of particular conceptual concepts  only.[37]