From "Evangelical Religion" by J.C. Ryle

Let us remember, not least, the enormous injury which we may do to souls, if we once allow ourselves to depart in the least degree from the simplicity of the Gospel either in our doctrine or in our worship. Who can estimate the shipwrecks that might occur in a single night, and the lives that might be lost, if a light-house keeper dared to alter but a little the colour of his light?—Who can estimate the deaths that might take place in a town, if the chemist took on himself to depart but a little from the doctor’s prescriptions?—Who can estimate the wholesale misery that might be caused in a war, by maps a little wrong and charts a little incorrect?—Who can estimate these things?—Then perhaps you may have some idea of the spiritual harm that ministers may do by departing in the slightest degree from the Scriptural proportions of the Gospel, or by trying to catch the world by dressing simple old Evangelical Religion in new clothes. J.C. Ryle