Hebrews 7:12 For the priesthood being changed, there is made of necessity a change also of the law.
1 Peter 2:3 If so be ye have tasted that the Lord is gracious.
4 ¶To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious,
5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
Thanks for your reply, but my question still is: Why did Jesus choose the Apostles; why single out anyone at all if there is to be no hierarchy?