And lessen your speech when you do speak

Al-Muntasir ibn Bilaal al-Ansaari:

و لن يَهلِكَ الإنسانَ إلا إذا أتى *** مِن الأمر ما لم يرضهُ نصحاؤه
و أقلل إذا ما قلتَ قولاً, فإنه *** إذا قلَّ قول المرء قلَّ خطـاؤه

A person can never be ruined unless he approaches
A matter which is not pleasing to his sincere advisors

And lessen your speech when you do speak,
For when the speech of a person is lessened, their mistakes are lessened