Srila Bhakti Sundar Govinda Dev-Goswami Maharaj discusses the Krishna conception appreciated by Sri Chaitanya Mahaprabhu.
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When somebody asked Mahaprabhu in Puri, “You are preaching Krishna-nam, and I have made many explanations of Krishna-nam; You please hear them”, Mahaprabhu said, “No, I do not want to hear many explanations.”
prabhu kahe,—“krishna-namera bahu artha na mani
‘shyama-sundara’ ‘yashoda-nandana,’—ei-matra jani
“I cannot tolerate many explanations of the Name of Krishna. Only that He is Shyamasundar, Radha-Shyamasundar, and He is Yashoda Nandan, the son of Nanda Maharaj. Those two are sufficient for Me.” He wants to hear nothing else, from anybody. That is the expression of Mahaprabhu.
prabhu kahe,—“krishna-namera bahu artha na mani
‘shyama-sundara’ ‘yashoda-nandana,’—ei-matra jani
“We want to know that He is Shyamasundar and He is Yashoda Nandan.” This is His identity.
Mahaprabhu also asked Raghupati Upadhyaya, “What is the most beautiful form of Krishna?”
Upadhyaya said, “Shyamam eva param rupam: Shyamasundar is the supreme form.”
“What is the supreme land?”
He said, “puri Madhu-puri vara: the supreme transcendental land is Mathura.” Inside of Mathura is Vrindavan. He told it in a wide way.
“What is the best age of the Lord?”
He said, “vayah kaishorakam dhyeyam.” Kaishor, that is, from thirteen to fifteen.
“What is the supreme rasa that satisfies the Lord?”
He said, “adya eva paro rasah: madhura rasa.” Adya rasa means madhura rasa, paramour conjugal love. That is the extreme.
Then Mahaprabhu happily told, “I learned from you now one shloka.”
shyamam eva param rupam puri madhu-puri vara
vayah kaishorakam dhyeyam adya eva paro rasah
(Sri Chaitanya-charitamrita, Madhya-lila: 19.106)