Demons sometimes declare to a devotee that they cannot accept the existence of God because they cannot see Him. But what the demon does not know is stated by the Lord Himself in Bhagavad-gita (7.25): naham prakasah sarvasya yogamaya-samavrtah. I am never manifest to the foolish and unintelligent. For them I am covered by yogamaya. The Lord is open to being seen by devotees, but nondevotees cannot see Him. The qualification for seeing God is stated in Brahma-samhita (5.38): premanjana-cchurita-bhakti-vilocanena santah sadaiva hrdayesu vilokayanti. A devotee who has developed a genuine love for Krsna can always see Him everywhere, whereas a demon, not having a clear understanding of the Supreme Lord, cannot see Him. When Hiranyakasipu was threatening to kill Prahlada Maharaja, Prahlada certainly saw the column standing before him and his father, and he saw that the Lord was present in the pillar to encourage him not to fear his demoniac fathers words. The Lord was present to protect him. Hiranyakasipu marked Prahladas observation and asked him, Where is your God? Prahlada Maharaja replied, He is everywhere. Then Hiranyakasipu asked, Why is He not in this pillar before me? Thus in all circumstances the devotee can always see the Supreme Lord, whereas the nondevotee cannot.