Only in Vrndavana is Krsna fully manifesting his pure transcendental nature which is based only on loving exchange and nothing else. It is not based on any sense of duty. Krsna is only purchased by pure and unalloyed love. To follow a sense of duty is the lower platform of devotional service. Vaidhi-bhakti – it is the platform where one is still materially conditioned and then one takes shelter of rules and regulations.
The higher manifestation of devotional service is devotional service based