The more words we speak, the less likely we are to measure and weigh our words enough to make sure that we do not sin against a person and more importantly God Himself. That is what proverbs is telling us here, thus the greater volume of words we speak the more likely we are to talk words that are sinful.
“In the multitude of words there wanteth not sin: but he that refraineth his lips is wise.”
Guard your steps as you go to the house of God and draw near to listen rather than to offer the sacrifice of fools; for they do not know what they are doing, idea is that of breaking with God and his perfect and absolute truth and wisdom. Instead we speak and within those words we depart from what He says.
Without care and forethought, there will not only be many weak things uttered. But much falsehood and at least many idle things which cannot be excused from sin. We can ask for forgiveness for careless words. If the pain of foolish words is not enough of a warning to us to avoid them, we should then remember the words of our Lord Himself on this matter.
“But I say unto you, That every idle word that men shall speak, they shall give account thereof in the Day of Judgment.
For by thy words thou shalt be justified and by thy words thou shalt be condemned.”
We will give an account for all the words we speak. That should remind us to speak fewer of them unless necessary.
Careful of what we says, that it is true and proper to be spoken; and considers well the time when, place where and persons to whom we speak; and at all circumstances weighed, conducts accordingly. The words you add beyond necessary speech contain most of your verbal sin. There would be less foolishness, teasing of siblings and dishonoring of parents. If people did it they would be less odious, contentious and overbearing. If angry bitter and cruel people did it there would be much less bleeding of wounded souls.
Wisely consider your words before you speak, rather than regret them after they are out. The wise man, measures his words before speaking them.