(Pro 12:18 KJV) There is that speaketh like the piercings of a sword: but the tongue of the wise is health.
What is a “wise” (2450) “tongue” (3956)? I have visions of a speaking ability that is the result of a lot of practice and hard work. I see a presentation full of great truths gleaned from the data bases (libraries) of the world. It seems to be something that is a great dream, but how can I reach it?
Consider the context of this verse. In the preceding verse it talks about truth and deceit. In the following verse it talks about truthful and lying. Could it be that the basic ingredients of a wise tongue are within reach of all of us? At least the first element is there and it is something that is within reach of all of us: Honesty. Speak the truth. You may not be able to give a detailed explanation of the Greek Aorist tense and how it relates to the substitutionary atonement. You can speak truth.
So? Take what you can get. Embrace honesty. The rest will come in its time.