Matthew 12:36-37

But I tell you that men will have to give account on the day of judgment for every careless word they have spoken.

Colossians 4:6

Let your speech always be full of grace, seasoned with salt, so that you may know how you ought to answer everyone.

1 Timothy 6:4-5

he is conceited and understands nothing; but he has a morbid interest in controversial questions and disputes about words, which produce envy, strife, malicious talk, evil suspicions,

Treasury of Scripture Knowledge

Summary

Should he reason with unprofitable talk? or with speeches wherewith he can do no good?

Bible References

He reason

Matthew 12:36
But I tell you that men will have to give account on the day of judgment for every careless word they have spoken.
Colossians 4:6
Let your speech always be full of grace, seasoned with salt, so that you may know how you ought to answer everyone.
1 Timothy 6:4
he is conceited and understands nothing; but he has a morbid interest in controversial questions and disputes about words, which produce envy, strife, malicious talk, evil suspicions,