By A.W. Tozer
Any act gains in power as it moves inward toward the heart. For this reason, the sins of the spirit are more iniquitous than those of the body. This was illustrated boldly by the attitude of our Lord toward these two kinds of sins and the corresponding two classes of sinners. He was the friend of publicans and harlots and the enemy of the Pharisees.
All sin is sinful and will be fatal to the soul if it is not forgiven and cleansed away. But for intensity of iniquity, the sins of the spirit are in a class by themselves. Yet they are the very sins which are most likely to be committed by religious people.
The careless sinner expresses himself overtly and so "releases" the moral tension; the religious sinner is not likely so to do. He scorns outward acts of wickedness and drives his sin inward to the sanctuary of his soul where it remains in a state of high compression. The notorious unloveliness of many religious people can be explained in this way.