In the Third Canto, Fifteenth Chapter, verse 43, of the Śrīmad-Bhāgavatam, there is a statement concerning the four saintly persons known as Catuḥ-sana, headed by Sanaka-kumāra. They went to visit the Lord of Vaikuṇṭhaloka in the spiritual sky, and when they bowed down before the Lord, the aroma of the tulasī, mixed with saffron, entered their nostrils and immediately attracted their minds. Although these four saintly persons were always absorbed in the thought of impersonal Brahman, from association with the Lord and from smelling the tulasī leaves the hairs on their bodies immediately stood up. This shows that even a person who is situated in Brahman realization, if he is put into association with devotees in pure devotional service, will immediately become attracted to the personal feature of the Lord.