Speaking the truth in love is a necessary part of being in the millennial kingdom of God, because no one who speaks untruth, and who refuses to repent, can remain in the kingdom.
Ask the indwelling Holy Spirit Of God to tell you how to speak truths that are difficult for you to speak. He will tell you exactly what you should say. He also will tell you exactly when and how you should say it.
The Lord God Almighty El Shaddai