If it's not necessarily apostleship, and it's not inspiration, what are the real reasons?

如果它不一定与使徒职分有关，与神启性无关，那真正的原因是什么？

By whom we have received grace and apostleship, for obedience to the faith among all nations, for his name.

我们从他受了恩惠，并使徒的职分，在万国之中叫人为他的名信服真道。

Augustine challenged Manichaeism by denying Mani's apostleship and condemning his rejection of biblical truth.

奥古斯丁挑战摩尼教，否认摩尼的使徒身份，谴责他拒绝圣经的真理。

For he that wrought effectually in Peter to the apostleship of the circumcision, the same was mighty in me toward the gentiles.

那感动彼得，叫他为受割礼之人作使徒的，也感动我，叫我为外邦人作使徒。

Rom. 1:5 Through whom we have received grace and apostleship unto the obedience of faith among all the Gentiles on behalf of His name.

罗一5我们藉著他，领受了恩典和使徒的职分，为他的名在万国中使人顺从信仰。