By searching after knowledge one realizes that his self is different from his material body, and when further advanced he comes to the knowledge of impersonal Brahman and Paramātmā. When one is fully purified, he realizes that his constitutional position is to be the eternal servant of God. So by association with pure devotees the inquisitive, the distressed, the seeker after material amelioration and the man in knowledge all become themselves pure. But in the preparatory stage, the man who is in full knowledge of the Supreme Lord and is at the same time executing devotional service is very dear to the Lord. He who is situated in pure knowledge of the transcendence of the Supreme Personality of God is so protected in devotional service that material contamination cannot touch him.