Abu Uthmaan An-Naysabooree [rahimahullaah] said: Whoever commands himself with the Sunnah in speech and action will speak with wisdom. And whoever commands himself with desires in speech and action will speak with innovation.
Unity is based on the Book and the Sunnah and not bidah. We do not look for a common enemy to unite against because as soon as we overcome him, we start fighting amongst ourselves.
In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Allaah [The Most High] said:
وَإِذْ قَالَ مُوسَىٰ لِقَوْمِهِ إِنَّ اللَّهَ يَأْمُرُكُمْ أَن تَذْبَحُوا بَقَرَةً
Shaikh Bin Baaz [rahimahullaah] said:
The conditions [to be fulfilled in order for repentance to be accepted are] three:  To be regretful and remorseful regarding the past (acts of disobedience you committed);  To renounce and abandon the sins
Shaikh Uthaymeen [rahimahullaah] said: If a person says: What will make a man love his wife and vice versa? We say: Allaah has clarified this in His statement:
And live with them honourably. [Soorah
Sufyaan Ibn Uyaynah [rahimahullaah] used to say: Indeed, the Messenger [sallal-laahu-alayhi-wasallam] is the greatest criterion [i.e. amongst mankind] and all affairs are presented to him [for judgement and judged] based on his manners, path and guidance;