From the time of their belief in God until today, people have harbored many incorrect motivations. When you’re not putting the truth into practice, you feel that all your motivations are correct, but when something happens to you, you will see that there are many incorrect motivations within you. When God makes people perfect, He causes them to realize that there are many conceptions within them that are obstructing their knowledge of God. When you recognize that your motivations are wrong, if you are able to stop practicing according to your conceptions and motivations, and are able to bear testimony to God and stand firm in your position in all that happens to you, this proves that you have rebelled against the flesh. When you rebel against the flesh, there will inevitably be a battle within you, there will inevitably be a battle within you. Satan will try and make you follow it, follow the conceptions of the flesh, and uphold the interests of the flesh—but God’s words will enlighten and illuminate you within, and it is up to you whether you follow God or follow Satan. It is because of this battle that people endure suffering and refinement; this is true suffering. When the battle comes upon you, if you are able to truly stand on the side of God, you will be able to satisfy God, you will be able to satisfy God.
from “Only Loving God Is Truly Believing in God” in The Word Appears in the Flesh