Proverbs 16:21 The wise in heart shall be called prudent: and the sweetness of the lips increaseth learning. KJV
This does not mean you sugar coat the Word, but rather choose words or actions that do not offend in such a way no one wants to listen. Too many times Christians are rude and crude not prudent. Ranting and raving, name calling and sounding like you are glad people are going to Hell is not a good delivery method for a herald of the King that is calling people to Him to be reconciled.
An impassioned plea from a heart grieved with the prospect of people missing the grace of God is one thing but brow beating screaming insults do not convey the message Christ came to give and gave us to give to the World. Taking a stand for truth is being bold. Being obnoxious is not.