The true doctrine [of the call to gospel ministry] is that no man, 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 labor. He is not here because he can be nowhere else, but he is nowhere else because he must be here.