Srimad Bhagavatam Canto 11, Chapter 05, Text 31

SB 11.5.31

iti dvapara urv-isa
 stuvanti jagad-isvaram
 kalav api tatha srnu
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
O King, in this way people in Dvapara-yuga glorified the Lord of the universe. In Kali-yuga also people worship the Supreme Personality of Godhead by following various regulations of the revealed scriptures. Now kindly hear of this from me.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The words kalav api, “in Kali-yuga also,” are very important in this verse. It is well known that Kali-yuga is an irreligious age. Thus it is surprising that in such a completely irreligious age the Supreme Lord is worshiped. Therefore it is stated kalav api, “even in Kali-yuga.” In Kali-yuga the incarnation of the Personality of Godhead does not directly assert Himself to be the Personality of Godhead, but rather He is detected by expert devotees in accordance with the revealed Vedic scriptures. Similarly, Prahlada Maharaja states in Srimad-Bhagavatam (7.9.38):
ittham nr-tiryag-rsi-deva-jhasavatarair
 lokan vibhavayasi hamsi jagat pratipan
dharmam maha-purusa pasi yuganuvrttas
 channah kalau yad abhavas tri-yugo ’tha sa tvam
“In this way, my Lord, You appear in various incarnations as a human being, an animal, a great saintly demigod, a fish or a tortoise, thus maintaining the entire creation in different planetary systems and killing the demoniac principles. According to the age, O my Lord, You protect the principles of religion. In the Age of Kali, however, You do not assert Yourself as the Supreme Personality of Godhead, and therefore You are known as Triyuga, or the Lord who appears in three yugas.” Thus it is understood that it is difficult for common people in Kali-yuga to recognize the incarnation of the Lord since in this age the Lord’s appearance is slightly concealed.
According to Srila Bhaktisiddhanta Sarasvati Thakura the word nana-tantra-vidhanena indicates the importance in Kali-yuga of the Vaisnava scriptures known as the Pañcaratras or Satvata-pañcaratras. It is stated in the Bhagavatam, stri-sudra-dvija-bandhunam trayi na sruti-gocara: in Kali-yuga it is impossible for ordinary people to perform highly technical Vedic sacrifices or the unbearable penances of the mystic yoga system. Such standard Vedic processes are practically inaccessible for the spiritually retarded population of Kali-yuga. Therefore the simple process of glorifying the Personality of Godhead by chanting His holy names is essential in this age. Such devotional processes as chanting the holy names of the Lord and worshiping His Deity form are elaborately described in the Vaisnava sastras known as Pañcaratras. Such tantric scriptures are referred to in this verse, and it is stated that in Kali-yuga these devotional processes, taught by great acaryas such as Narada Muni, are the only practical means for worshiping the Lord. This will be more clearly explained in the following verse.
Srimad Bhagavatam Canto 11, Chapter 05, Text 29-30
Srimad Bhagavatam Canto 11, Chapter 05, Text 32