A word to preachers. Truth and falsehood is a good pair of categories to use when deciding what to preach. Speak truth not falsehood.
But there is another crucial pair of categories. God tells Jeremiah that he must use this pair if he would be faithful:
Therefore thus says the Lord: "...If you utter what is precious, and not what is worthless, you shall be as my mouth. (Jeremiah 15:19)
In deciding what to preach make these two judgments: Is it true and is it precious? Preach what is both. If it is true, preach it with authority. If it is precious, preach it with passion.
One great reason why some preaching leaves people unmoved is that preachers seem unmoved. Is this precious or isn't it? That is the question in the hearts of the people. If it is, why don't you sound like it?
The great battle of preaching is to see what's true and to savor what's precious. Weak seeing and weak savoring are a curse to God's people.
Brothers, plead for deliverance from this curse. The ordinances of the Lord are true and righteous altogether. They are more precious than gold and sweeter than honey (Psalms 19:9-10).