Govinda lilamrita Verse 1

I offer my pranams unto the Lord of Vrindavan, Sri Govinda-the mandir of all pleasure, the pleasure-giver of the Vrajavasis-whose own pleasure overflows in the association of Srimati Radhika.

Rasa-tarangini Tika: 

Govinda-lilamrita's topics are presented in this nandi shloka or opening verse. Our Govinda is a dhira-lalita nayak and a rasamaya-nagar. This means that he is a carefree youthful romantic, who is overflowing with the rasa of flirtatious love dalliances in the company of the Vraja sundaris. Herein lies Sri Bhagavan's sweetest feature and eternal occupation. 

Vishwanath Chakravarti's nandi shloka in the Krishna-bhavanamrita describes further:

Rasamaya-nagar Shyam, and Rasamayi-nagari Radha are both expert in the practice of Cupid's martial arts. Hence the irrepressible wish to prove the superiority of their own talents brought about "Ananga's war!" 

Then, finally, their sakhi named Fatigue invited Nidra Devi (sleep) to put an end to their battle. (Krishna-bhavanamrita 1.3) 
 With this beautiful metaphor, Srila Vishwanath Chakravarti paints a vivid picture of Sri Yugala Kishor's mutual subjugation. This shloka is the main seed of Krishna-bhavanamrita, and it appears again at the end of the book as well (52).

Srila Vishwanath is thus making the following interesting siddhanta:
Radha Krishna's eightfold daily pastimes are like a jeweled japa mala, in which each lila represents a gem-like bead. This shloka is the head bead. Thus, just as a chanter begins and ends each round of his chanting at the mala's head bead, the smaran of Radha Krishna's gem-like pastimes begins, ends, and continues from this point. In this way, Srila Vishwanath hints that as one chants japa on his mala, he should also focus his attention deeply on Radha Govinda's ashta-kala lila-mala. In this way, the Hare Krishna maha mantra and lila smaran go hand in hand. 

Govinda-lilamrita, Krishna-bhavanamrita, Vidagdha-madhava, Lalita-madhava, Dana keli-kaumudi, etc., are all termed rasa-granthas because these books deal exclusively with the nectarean rasa of Radha Govinda's madhura Vraja lilas. Gita-govinda is also a rasa grantha, and in its nandi shloka Sri Jayadev Goswami addresses his Vaishnava readers as follows:

yadi hari-smaraṇe sa-rasaḥ mano
yadi vilāsa-kalāsu kutūhalaḥ
madhura-komala-kānta-padāvalīḥ
śṛṇu tadā jayadeva-sarasvatim

If one desires to refresh his mind by remembering Sri Hari's madhura pastimes, if one's curiosity to know about Sri Krishna's prema vilasa with the Vraja gopis awakens-then, by all means read the sweet poetry composed by Sri Jayadeva Goswami. (GG 1.3)

This simple desire and innocent curiosity are the natural assets that render Vaishnavas eligible to appreciate the Govinda-llilamrita.