Jesus speaking to his disciples in Mat 10:27 says: "What I tell you in darkness, that speak ye in light". Maybe today when God speaks to you “in the dark” he refers to the Spirit speaking to you. Or, you think, is it only you getting an impression in your mind? You wonder, “is this God speaking to me, or is it just my own mind that is coming up with this?” Is it God “whispering in your ear” via a recollection of an idea you got out of private study of God's word?
In any case, it can help to make these things public. Sometimes others can help us know whether something is from God. Maybe someone can help us get a better understanding of what we heard. Maybe someone has a caution about what we heard and can back it up with a Scripture reference. Anything truly beneficial God tells us should be told to others
In any case, we know it must conform to God's word. We cannot change the meaning of God's commandments for our own convenience as did the Pharisees when they said, “It is corban [a gift to God] by whatsoever you may be profited by me.” Instead of giving a gift for the intent of making another’s life easier, they were using this act as a bribe to God to make themselves appear somehow pious.
What was happening with the disciples in private would indeed be made public. For example: the Last Supper, the Mount of transfiguration, the fishing scene of John 21, Peter's betrayal, the widow’s two mites. “There is nothing hidden that will not be made known” demonstrates that God is open and upfront.
