Govinda Lilamrita 1.11

Seeing the night about to end, Vrnda-devi ordered the obedient birds of Vraja to awaken Sri Sri Radha and Krsna. 12- The birds were eager to render some service. Obeying vrnda-devi's order they happily warbled throughout that pastime-grove in order to awaken the Divine Couple. Govinda Lilamrita 1.11

Purport Srila Gaurahari Das: When the night of ignorance of the Absolute Truth is destined to end, by the will of the Supreme Personality of Godhead, The divine couple send their confidential servants to awaken them in the hearts of the still sleeping world. These confidential servants or Spiritual Masters have at first secretly been awakened and educated about the eternal truth Love of God, Love of Krishna, just like when Madhavendra Puris love of Krishna was awakened in secret: Then he was ordered by Krishna in a dream, due to the power of that ecstatic love, to engage others like the fortunate birds who take refuge in a branch of a fruitful   tree of love of Krishna become naturally eager to render some pure-hearted service of waking up the divine couple or love of God in the hearts of the sleeping world. This is a confidential deeply esoteric example of how the parampara system works following in the footsteps of the revealed scriptures.