Instead, we will become peacemakers. I think the Apostle Peter sums it up well. Do not repay evil with evil or insult with insult, but with blessing, because to this you were called so that you may inherit a blessing. Spread wisdom not verbal manure. The tongue of the wise commends knowledge, but the mouth of the fool gushes folly.
Wise words are words that commend knowlege instead of folly.
To commend something means to praise it, to recommend it, to hold it up as something worth pursuing. To spread it, as verse 7 says. So wise people will speak in a way that recommends godliness as the best option. It means we will be able to give godly advice when people ask us for it. It means that we will have knowlege that is worth passing on.