Especially in this age of Kali, saṅkīrtana alone is sufficient. If the members of our temples in the different parts of the world simply continue saṅkīrtana before the Deity, especially before Śrī Caitanya Mahāprabhu, they will remain perfect. There is no need of any other performances. Nevertheless, to keep oneself clean in habits and mind, Deity worship and other regulative principles are required. Śrīla Jīva Gosvāmī says that although saṅkīrtana is sufficient for the perfection of life, the arcanā, or worship of the Deity in the temple, must continue in order that the devotees may stay clean and pure. Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura therefore recommended that one follow both processes simultaneously. We strictly follow his principle of performing Deity worship and saṅkīrtana along parallel lines. This we should continue.
(Srimad Bhagavatam--6:3:25--purport).

Being affected by the conditioning of matter, Māyāvādī philosophers cannot see the difference between the Supreme Lord and the living entity. When the sun is reflected in a pot of water, the sun knows that there is no difference between himself and the reflected sun in the water. Those in ignorance, however, perceive that there are many small suns reflected in each and every pot. As far as the brilliance is concerned, there is brilliance both in the original sun and in the reflections, but the reflections are small, whereas the original sun is very large. Vaiṣṇava philosophers conclude that the living entity is simply a small sample of the original Supreme Personality of Godhead. Qualitatively, God and the living entities are one, but quantitatively the living entities are small fragments of the Supreme Personality of Godhead. The Supreme Lord is full, powerful and opulent.
(Srimad Bhagavatam--4:28:63--purport).

Nanda-Kiśora: What happens to a person if we just give him out on the street one Simply Wonderful or some prasādam, one piece of prasādam?
Prabhupāda: That is wonderful, simply wonderful. (laughter) He has not tasted such wonderful sweet in his life. Therefore you give him wonderful, and because he's eating that wonderful sweet, one day he'll come to your temple and become wonderful.
Devotees: Jaya!
Prabhupāda: Therefore it is simply wonderful. So go on distributing this Simply Wonderful. Your philosophy is simply wonderful. Your prasādam is simply wonderful. You are simply wonderful. And your Kṛṣṇa is simply wonderful. The whole process of simply wonderful. And He acts wonderfully, and it is acting wonderfully. Who can deny it?
Devotee: Prabhupāda is simply wonderful.
Prabhupāda: That's all right. You can become... Everyone. All right, have kīrtana.
(Letter--Los Angeles--20th. July, 1971).