James teaches many things in this section, but above all he teaches us that the word of truth (God's word) gave birth to us, is planted within us, and saves us. It is that word that teaches us humility, how to persevere through trial to build our faith and become mature, how to ask for and receive wisdom, and how to live out our faith. We are to be DOERS of this word, not listeners only. When we LIVE the word, we practice religion that is not worthless but that is pure and faultless.
Do you believe this word? If you do, dedicate your whole life to applying it.