The gospel reading for Trinity Sunday reminds us that Holy Spirit continues to speak to us.
Jesus was reassuring his disciples that even after he left them, the Spirit would continue to be their guide. This reassurance is meant for us, as well. We can continue to hear.
Jesus spoke to specific people, living in a particular geographic area, subject to the laws and customs of their time. Because of the Holy Spirit, we are able to hear the truth that will guide us--as different as we are from the original disciples, as different as our governments and environments are.