The call of God does what the call of man cannot. It raises the dead.

Monastic vows rest on the false assumption that there is a special calling, a vocation, to which superior Christians are invited to observe the counsels of perfection while ordinary Christians fulfil only the commands; but there simply is no special religious vocation since the call of God comes to each at the common tasks.

If God has fit you to be a missionary, I would not have you shrivel down to be a king.

Holiness consisteth not in a cowl or in a garment of gray. When God purifies the heart by faith, the market is sacred as well as the sanctuary; neither remaineth there any work or place which is profane.

All the church is to be made up of tellers. Not everyone is to be a missionary, not everyone a minister, but there is no Christian that's really become a Christian who doesn't have laid upon him the admonition of Paul to be a debtor. Everyone is bound to be a teller in his own place, in his own calling, according to the individual vocation which God has given him. Death in the City (Downers Grove, InterVarsity Press: 1969) 122

A holy calling will not save an unholy man.

'Not called!' did you say? 'Not heard the call,' I think you should say. Put your ear down to the Bible, and hear him bid you go and pull sinners out of the fire of sin. Put your ear down to the burdened, agonized heart of humanity, and listen to its pitiful wail for help. Go stand by the gates of hell, and hear the damned entreat you to go to their father's house and bid their brothers and sisters, and servants and masters not to come there. And then look Christ in the face, whose mercy you have professed to obey, and tell him whether you will join heart and soul and body and circumstances in the march to publish his mercy to the world.

Why He draweth one and draweth not another, seek not thou to judge, if thou wish not to err. Tract. super Joan. xxvi