Is it the group of people who always complain? Is it the person on your team who has the unique balance of paranoia and optimism? Is your calendar filled with appointments that will require you to listen to those who come to the table to tell you all of the reasons why you are going to fail even though that's not what the data says?
There is some truth to the old saying that we were given two ears and one mouth so we should use them proportionally, and we should use both wisely. Who we listen to matters to our ability to stay focused on the cause, to end the day feeling like we made progress, to hear all of the evidence we need to make an informed decision.
You words are valuable your ears are invaluable. When someone wants to borrow your ear and you know the cost of listening is too much, be bold enough to say "not now," "no thank you."