Here are some nectarean verses from Sri Caitanya Bhagavata by Srila Vrindavana dasa Thakura about the instant results we get in Harinam Japa and Kirtan simply by hearing, singing, reading, or understanding Nityananda’s pastimes.

Please don’t think that the below verses are exaggerations because the Lord fulfills the words of His pure devotee like Srila Vrindavan dasa Thakura much more swiftly and with much more certainty than even His own words, according to the Bhagavad Gita 9.31 (kaunteya pratijanihi, na me bhaktah pranasyati).
● 1. Attain Gaurachandra by Hearing Nityananda Lila
je sunaye nityananda
prabhura akhyan
tahare miliba gaura
chandra bhagavan
(Chaitanya Bhagavata 3.5.705)
“One who hears the pastimes and glories of Nityananda will spontaneously attain the Supreme Lord Gaurachandra.”
● 2. See Both the Lords Face to Face by Nityananda Lila
dasyu-gana-mochan
je chitta diya sune
nityananda chaitanya
dekhibe sei jane
(Chaitanya Bhagavata 3.5.706)
“One who attentively hears how Nityananda delivered the thieves will see Nityananda Chaitanya face to face.”
● 3. Get Gaura’s Eternal Support and Protection by Nityananda Lila
tanhara charitra jeba
jane, shune, gaya
sri krishna chaitanya
tanre parama sahaya
(Chaitanya Bhagavata 1.1.18)
“One who tries to know about, hear, or sing the pastimes and glories of Nityananda will always be protected and supported in all ways by Gauranga Himself.”
● 4. No More Struggles in Life by Nityananda Lila
nityananda janile
apad nahi kati
(Chaitanya Bhagavata 1.9.220)
“One who knows Nityananda will never face any calamities or obstacles.”
● 5. Get the Treasure of Pure Love by Nityananda Lila
nityananda svarupera
tirtha-paryatana
jei iha sune tare
mile prema-dhana
(Chaitanya Bhagavata 1.9.237)
“One who simply hears of the divine travels of Nityananda to the holy places will receive the treasure of pure love.”
● 6. Hear About Nityananda’s Arrival in Navadvipa
navadvipe nityananda-
chandra agaman
iha jei sune tare
mile prema-dhana
(Chaitanya Bhagavata 2.3.136)
“One who hears the pastimes of Nityananda’s arrival in Navadvipa will receive the treasure of pure love.”
● 7. Never Let the Seed of Ninda to Even Sprout by Nityananda Lila
je gaya, je sune
e sakala punya-katha
vaishnava-aparadha tara
na janme sarvatha
(Chaitanya Bhagavata 3.4.395)
“Critical mentality for devotees will never take birth in one, or be considered for one, who sings or hears the spiritually pious pastimes of Nityananda.”
Thus, this main offense, which blocks our taste in the Hare Krishna Maha Mantra for many many lifetimes, is finally uprooted by the always offenseless, all-offense-destroying, all-forgiving, and all-merciful Nityananda Lila.
● 8. From the Lowest to the Highest in An Instant by Nityananda Lila
chaitanya mangala sune
jadi pashandi yavana
seha maha-vaishnava
haya tatakshana
(Chaitanya Charitamrita 1.8.38)
“Even the most antagonistic pretender or non-believer, who simply hears Nityananda Gauranga’s pastimes in the form of Chaitanya Bhagavata, becomes a maha-vaishnava, or the greatest devotee, that very moment.”
● 9. Chaitanya Bhagavata is Primarily Nityananda Lila
nityananda-lila varnane
haila avesa
caitanyera sesa-lila
rahila avasesa
(Chaitanya Charitamrita 1.8.48)
“In Sri Chaitanya Bhagavata, Srila Vrindavana dasa Thakura became blissfully intoxicated and ecstatically surcharged to describe the pastimes of Nityananda in great detail. Due to this, the remaining pastimes of Gauranga in Puri partly remained undescribed.”
This statement by Srila Krishna dasa Kaviraja proves that Chaitanya Bhagavata is primarily Nityananda Lila, spoken in the heart of Srila Vrindavan das by Gauranga Himself, because he followed the direct order of Nityananda to compose it. This is why it is the most merciful scripture in creation, and thus was the very first scripture recommended by Srila Bhaktisiddhanta to read 100 times in Gaudiya Matha, ideally by learning to read or sing it in the original Bengali itself.
● 10. The Merciful Form of Srimad Bhagavatam in Kaliyuga is Nityananda Lila
yate jani krsna-bhakti
siddhantera sima
(Chaitanya Charitamrita 1.8.36)
“By reading Sri Chaitanya Bhagavata, one can grasp the ultimate limits of the absolute truths about Krishna Bhakti.”
Srila Swami Prabhupada’s purport:
“Due to misunderstanding Srimad-Bhagavatam, people are misled regarding the science of Krsna. However, by reading Srila Vrndavana dasa Thakura’s book one can VERY EASILY understand this science.”
“Under these circumstances, it is a great aid for the common man to read Srila Vrndavana dasa Thakura’s Caitanya-bhagavata, for thus he can ACTUALLY understand devotional service, Krsna, Lord Caitanya and Nityananda.”
● 11. The Deepest Truths of Srimad Bhagavatam Made Accessible by Nityananda Lila
bhagavate yata bhakti-
siddhantera sara
likhiyachena inha jani’
kariya uddhara
(Chaitanya Charitamrita 1.8.37)
“Knowing that the Kaliyuga souls will commit offenses on hearing Srimad Bhagavatam, the same Srila Vyasadeva in the form of Srila Vrindavana dasa Thakura, wrote the same absolute truths of Srimad Bhagavatam in a much more accessible manner in the form of Sri Chaitanya Bhagavata to deliver the Kaliyuga souls.”
Radha is Mahabhava, Krishna is Madhurya, Gauranga is Audarya, and Nityananda is Maha-Audarya. So Sri Chaitanya Bhagavata and Nityananda Charitamrita are the supreme Maha-Audarya scriptures of mass deliverance in Kaliyuga.