As a devotee is advancing in Krsna Consciousness and becoming more experienced, as he has been practising prescribed activities that Lord Krsna has revealed in the scriptures for a long time, he becomes more sensitive to the indications from Krsna and it becomes more relevant for him - not that then he takes these indications and this is carved in stone. He takes these indications from Krsna and confirms them.
We can also see how Krishnadas Goswami was taking it like that. He was getting orders from different vaisnavas with requests to write the Caitanya Caritamrita and then looking for an indication from Krsna. Is Krsna really favouring this idea or not? And in this way, we see that devotees, instead of being so fixed about their own plan, are kind of ready to bend and to change their course for the plan of Krsna.
But if in the interests of the Lord, there's another service coming up, he may change just like that and take it. So one takes it that the Lord speaks through the mouth of the vaisnavas. There's a quote that Prabhupada gave - it doesn't want to come to mind - but it's referring to a group of vaisnavas that Krsna speaks through the mouth of a group of vaisnavas. When there is a group of vaisnavas then we understand that Krsna is revealing His plan through those devotees.
(Kadamba Kanana Swami 2003)