In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Shaikh Rabee Bin Haadi [may Allaah preserve him] said:
We have been commanded to learn; therefore, it is obligated on us to learn, act [upon what we learn] and call to the [religion] of Allaah [The Blessed and Exalted] based upon the path which Allaah has ordained and clarified for us- the path which the Messenger clarified for us and applied, and which was [also] applied by his companions after him. They spread Islaam in the entire world – in different nations. And this knowledge [of Islam] and goodness was spread mostly through [excellent, praiseworthy etc] manners – through patience, forbearance, firm fulfilment of obligations and responsibilities, truthfulness, honourable behaviour, nobility, noble mindedness, fulfilling promises and what is similar to that. These [excellent, praiseworthy etc] manners became manifest to the people, so the hearts, ears and eyes of the nations accepted this guidance, which the companions of Muhammad [sallal-laahu-aalayhi-wasallam] carried.
Source: Marhaban Yaa Taalibal Ilm’ page 86. Abridged & slightly paraphrased