If you know something hurtful and not true, don't say it. If you know something hurtful and true, don't say it. If you know something helpful but not true, don't say it. If you know something helpful and true, find the right time to say it.
So in this case, Kalamas, don't go by reports, by legends, by traditions, by scripture, by logical conjecture, by inference, by analogies, by agreement through pondering views, by probability, or by the thought, 'This contemplative is our teacher.' When you know for yourselves that, 'These qualities are unskillful; these qualities are blameworthy; these qualities are criticized by the wise; these qualities, when adopted & carried out, lead to harm & to suffering' - then you should abandon them.
If you endeavor to embrace the Way through much learning, the Way will not be understood. If you observe the Way with simplicity of heart, great indeed is this Way.