Matthew 12:36-37

But I say to you, That for every idle word which men speak, they shall give account in the day of judgment.

Colossians 4:6

Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every one.

1 Timothy 6:4-5

he is mad with conceit, knowing nothing, but has a morbid fondness for questions and contentions about words, out of which come envy, strife, railing, 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 say to you, That for every idle word which men speak, they shall give account in the day of judgment.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that you may know how you ought to answer every one.
1 Timothy 6:4
he is mad with conceit, knowing nothing, but has a morbid fondness for questions and contentions about words, out of which come envy, strife, railing, evil suspicions,