Matthew 12:36-37

And I say to you, that every idle word that men shall speak, they shall give account concerning it in the day of judgment;

Colossians 4:6

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

1 Timothy 6:4-5

he has become puffed up, knowing nothing, but morbid about questions and word-battles, out of which come envy, strife, railings, 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 to you, that every idle word that men shall speak, they shall give account concerning it in the day of judgment;
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer each one.
1 Timothy 6:4
he has become puffed up, knowing nothing, but morbid about questions and word-battles, out of which come envy, strife, railings, evil surmisings,