The Holy Spirit is the one by whom the apostles received spiritual things, were able to communicate them, and by whom, thereupon, others were able to discern them (1 Cor. 2:12,15). It is the same Spirit whom the apostles received in order to know the things of God and by whom others have discerned them — that is, the apostolic gift of revelation and of communication, and the gift of spiritual understanding in the simple believer.
J. N. Darby