Preserving Faith and the Believer's Self-Knowledge

Question:
The questioner asks: How does a Muslim preserve his faith, and how does he know that he is among the believers?

Answer:
He preserves his faith by knowing what faith is, what its pillars are, and what its branches are, so that he may fulfill them. He fulfills its pillars and as many of its branches as he is able, and he increases in righteous deeds. In this way, a person preserves his faith. He avoids the causes of fitnah (trial, discord or temptation) and the nullifiers of Islam; he stays away from them and from the evils that harm him in his religion. He keeps the company of the people of good and stays away from the people of evil. This is part of preserving faith. Also, more important than all of this is that he learns beneficial knowledge from the Book and the Sunnah, so that he knows the reality of faith and how to preserve it, what increases it, and what decreases it, so that he may preserve it. Yes.

The presenter:
May Allah bless you.