Matthew 12:36-37

And I say unto you, that every idle word whatsoever men shall speak, they shall give an account concerning the same in the day of judgment.

Colossians 4:6

Let your word be always with grace, seasoned with salt, that you may know how it behooves you to answer each one.

1 Timothy 6:4-5

he has been inflated, knowing nothing, but doting about questions and controversies, from which come envy, strife, blasphemies, evil surmisings,

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
And I say unto you, that every idle word whatsoever men shall speak, they shall give an account concerning the same in the day of judgment.
Colossians 4:6
Let your word be always with grace, seasoned with salt, that you may know how it behooves you to answer each one.
1 Timothy 6:4
he has been inflated, knowing nothing, but doting about questions and controversies, from which come envy, strife, blasphemies, evil surmisings,