SHAFAQNA – Imam Ali (AS) said: Be careful that you do not break up the good behaviour and replace it with inappropriate behaviour! Coordinate the tongue and the heart. The human being must guard his/her tongue, because this unruly tongue will destroy his/her owner. Swear to God, I have not seen a pious person that his/her piety is useful to him/her except by protecting his/her tongue .
 Nahjul Balaghah, Sermon 176.