"Whether young or old, rich or poor, learned or unlearned, should presume to dispense the mysteries of Christ without the strongest of all possible reasons for doing so - the imperative, invincible call of God. No one is to show cause why he ought not to be a Minister: he is to show cause why he should be a Minister. His call to the sacred profession is not the absence of a call to any other pursuit; it is direct, immediate, powerful, to this very department of labour. He is not here because he can be nowhere else, but he is nowhere else because he must be here."