". . . the only condition of discipleship permitted by Christ to any believer is complete self-consecration to his' service. In this the self-devotion of the minister is just the same as that of all other true Christians. If a Christian man proposes to be a teacher, physician, lawyer, mechanic, or farmer, it must be, not chiefly from promptings of the world or self, but chiefly because he verily believes he can, in that calling, best serve his heavenly Master. If he hath not this consecration, we do not say he is unfit for the ministry only, he is unfit to be a disciple of Jesus Christ. If any man think this standard of dedication too strict, let him understand at once that he is " not fit for the kingdom of God;" let him relinquish his delusive hope of salvation; let him at once go back among the dark company of Christ's enemies, on the ground scathed and riven by the lightnings of his wrath, and under the mountainous load of all his sins unatoned and unforgiven. There is no other condition of salvation. For did not Christ redeem the whole man ? Did he not purchase with his blood all our powers, and our whole energies, if we are his disciples? We profess to desire to love him with our whole souls, and therefore what reason is there which demands a part of the exertion and service in our power which does not also demand the whole?"
Dabney, Robert L., Discussions, Vol. III, What is a call to the ministry? (1891)