Close the mouth.  Say nothing when inside the human part of you is bursting to talk back, to make a retort, to explain, to make an excuse, to justify.  Oh yes, especially in these cases.  Close the mouth.  Bite the tongue, seal the lips, sit on your hands, and listen.  Listen to the frantic, boisterous, virulent, bubbling thoughts that want so badly to burst forth.  Why are they so active?  What are they trying to defend?  Who?  Just keep listening, and then listen some more.  Who, exactly, is doing the listening?  And beyond that person, who and what is listening?  Keep going back, back, back until you find no more thoughts.  When you come to that Source, to This that never changes within, you will find there perhaps a mismatch between what arises from that Source and what wanted to burst forth moments earlier.  You will find, if you have drifted back and waited long enough, nothing but peace, nothing but calmness, and you will find most likely, that the need to speak your piece has disappeared, for you have found your peace within.