One of my biggest pet peeves is when people say, "God told me to tell you ______." It's not that I can't let God speak to me through other people, but I have a hard time believing that what these people say really has anything to do with God. Often when I've experienced this or I've heard stories from others experiencing it, the person really just has a strong opinion or is angry about something. Often such messages aren't communicated in a way that honors God anyway, and it reminds me of Gandhi's famous quote, "I like your Christ, I do not like your Christians. Your Christians are so unlike your Christ." Nonetheless, I have a responsibility to take those words before the Lord and to pray for the truth of them to be revealed to me.
Ezekiel was given the important task of speaking to the soon-to-be-exiled nation of Israel. His words weren't going to be happy ones, but he still had the responsibility of speaking them. Should he have chosen not to, then the sin of the people would have been on his shoulders as the bearer of truth. Once people are made aware of the truth, it's their responsibility to heed it. But to have truth and to hold back from sharing it puts the burden of guilt on your own shoulders. If God has genuinely given you some truth that needs to be shared, don't be slow in sharing it. If someone speaks "a word from the Lord" to you, then go to the Lord to find the truth that exists. In both cases, we need to prayerfully approach the Lord so as to be responsible with what He has given us.