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" In God’s school, the teachers must be masters of the art of holiness. If we teach one thing by our lips and another by our lives, those who listen to us will say, “Physician, heal thyself.” “Thou sayest, ‘Repent.’ Where is thine own repentance? Thou sayest, ‘Serve God, and be obedient to His will.’ Do you serve Him? Are you obedient to His will?” An unholy ministry would be the derision of the world, and a dishonour to God. “Be ye clean, that bear the vessels of the Lord.” He will speak through a fool if he be but a holy man. I do not, of course, mean that God chooses fools to be His ministers; but let a man once become really holy, even though he has but the slenderest possible ability, he will be a more fit instrument in God’s hand than the man of gigantic acquirements, who is not obedient to the divine will, nor clean and pure in the sight of the Lord God Almighty. "
― Charles Haddon Spurgeon , The Soul Winner