There is a class of coal called "blind coal," because it burns without showing any flame. But although it shows no flame it may yield a good heat. If it cannot be seen it may be felt. Is it not possible to have a flaming lip testimony and yet the life to lack warmth? There are blind coal Christians, very useful ones, who are not to be seen so much as felt. Still it is better to have both flame and heat, both lip and life testimony.