Every unkind thought reflects a defect in my soul, which is connected to my mind, which is connected to my brain. Therefore, how can I ever be sure that my unkind thought is accurate? And if I'm not sure it's accurate, shouldn't I keep quiet, rather than take the risk of saying something false? And if it may not be accurate, isn't it foolish to entertain the thought?
And why do I say every unkind thought reflects a soul defect? Because every unkind thought emanates, at some level, from selfishness, from an offended ego, from pride–the primordial and first sin.