“We may find some mailboxes on the street, and if we post our letters in those boxes, they will naturally go to their destination without difficulty. But any old box, or an imitation, which we may find somewhere, which is not authorized by the post office, will not do the work. Similarly, God has an authorized representation in the Deity form, which is called archa-vigraha. This archa-vigraha is an incarnation of the Supreme Lord. God will accept service through that form.” (Shrila Prabhupada, Bhagavad-gita, 12.5 Purport)

“If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it.” (Lord Krishna, Bhagavad-gita, 9.26)

“The Personality of Godhead heard the appealing voices of His friends, and casting a pleasing glance over them, He began to answer. By speaking through His eyes, He impressed His friends that there was no cause for fear. Then Krishna, the supreme mystic, the powerful Personality of Godhead, immediately swallowed up all the flames of the fire. The cows and boys were thus saved from imminent danger.” (Krishna, The Supreme Personality of Godhead, Vol 1, Ch 19)

“Although Prahlada is only five years old, even at this young age he has given up his affectionate relationship with his father and mother. Therefore, he is certainly untrustworthy. Indeed, it is not at all believable that he will behave well toward Vishnu.” (Shrimad Bhagavatam, 7.5.36)

“While Krishna was going to the fruit vendor very hastily, most of the grains He was holding fell. Nonetheless, the fruit vendor filled Krishna’s hands with fruits, and her fruit basket was immediately filled with jewels and gold.” (Shrimad Bhagavatam, 10.11.11)

“Of what use are wealth, comforts and pleasures, home, wives, and sons if one is not able to see Shri Rama?” (Valmiki Ramayana, Ayodhya Kand, 48.7)

“Prahlada Maharaja replied: Because of their uncontrolled senses, persons too addicted to materialistic life make progress toward hellish conditions and repeatedly chew that which has already been chewed. Their inclinations toward Krishna are never aroused, either by the instructions of others, by their own efforts, or by a combination of both.” (Shrimad Bhagavatam, 7.5.30)

“Shri Hari, who is the Lord of the demigods, who is worshiped by the people of the world, for benefiting the moving and nonmoving beings of the world took that dreadful form through His own energy and tore apart Hiranyakashipu, who caused suffering to so many, with His nails.” (Narasimha Purana, 44.43)