You should keep your head on the feet of persons like Mother, Father and Guru and convince your point to them. Think carefully hundred times before expressing your displeasure to them. You should never win in the situation where winning actually means getting defeated.
The enemy against whom getting defeated will cause loss of our fame and emerging victorious will make us sorrowful and sinful. And if a quarrel breaks with such enemy then we should control ourselves and settle the issue.
If a person can die by consuming honey, dont use poison for killing him.
If we speak words of benefit to someone then the animosity with the person decreases and the bonds of friendship become strong. This proves that when we speak to others we should speak for their benefit.
Don't swing your tongue in the fit of anger, you may swing your sword instead. Think a lot and then speak sweet words for the benefit of others.