A.W. Tozer
This generation has forgotten that the gospel message does not clean up and shine the outside of a person, rather it bores into the very heart and soul of a person and radically changes that person from the inside forever.

Gospel tracts are fantastic for young people or any Christians who have but little power and little ability, but nevertheless, wish to do something for Christ. They have not the tongue of the eloquent, but they may have the hand of the diligent. They cannot stand and preach but they can stand and distribute here and there these silent preachers.
Charles Spurgeon