1. The greatest fault of man having faith in God is that his faith is in words only. All men, indeed, believe in the existence of God, yet God is not a part of their everyday lives. Many prayers to God come from the mouth of man, but God has little place in his heart, and so God tries man again and again. As man is impure, God has no alternative but to try man, so that he may feel ashamed. Otherwise, man shall all become the children of the archangel.
2. During man’s belief in God, his motives are unceasingly cleansed by God. Otherwise, no man can be used by God, and God has no way of doing in man the work that He ought. God first cleanses man. In the process of cleasing man, God gets man to know himself, and in this process God changes man. Only after this can God work His life into man, and only in this way can the heart of man be fully turned to God.
3. If you only have knowledge but do not have God’s word as life; if you are limited only to your own knowledge but cannot practice the truth or live out the word of God, then this is proof still that you have no heart of love for God. Coming to know God by believing in Him; this is the final goal and that which man shall seek. You must devote effort to living out the words of God so that they may be realized in your practice. If you have only doctrinal knowledge, then your faith in God will come to naught. Only if you then also practice and live out His word can your faith be considered complete and in accord with God’s will.
from “You Ought to Live for the Truth Since You Believe in God” in The Word Appears in the Flesh