The reason for not attempting to purify the nominal systems is that no amount of cleansing would make the unconsecrated mass of "Christendom" and the… - Charles Taze Russell

As a people [Jews] still have faith in God, though in their blindness and pride of heart they have stumbled over the humility of God's appointed messenger for the world's salvation; so that, instead of receiving him, they crucified the Savior, the Lord of glory. And yet the apostles and prophets show us that even this flagrant crim, to which their pride and self-will drove them, was not one which could never be forgiven them. Because of it, they have been punished, and that severely. When they condemned the Just One and said, "His blood be upon and upon our children," they little expected the fearful recompense which followed.

What is the secret of the opposition and slander that is being raised up against me and against all who, like me, are Bible students? It is malice, hatred, envy, strife, on the part of those who are still hugging the nonsense of the Dark Ages and neglecting true Bible study. They see that their influence is waning. But they have not yet awakened to the true situation. They think that I am responsible for their smaller congregations and small collections. But not so. The real difficulty for them is that the people are becoming more intelligent and can no longer be driven with the crack of a merely man-made whip of fear.

Glancing along the pathway of the Church, from Luther's day until now, we can see that, step by step, reform of cleansing has progressed; for each set of reformers, as soon as they accomplished their own little item of cleansing, stopped and joined the others, in opposition to all further reform or cleansing.