The apostate is left naked and destitute of the Spirit of God

Strange as it may appear at first thought, yet it is no less strange than true, that notwithstanding all the professed determination to live godly, apostates after turning from the faith of Christ, unless they have speedily repented, have sooner or later fallen into the snares of the wicked one, and have been left destitute of the Spirit of God, to manifest their wickedness in the eyes of multitudes. From apostates the faithful have received the severest persecutions. Judas was rebuked and immediately betrayed his Lord into the hands of His enemies, because Satan entered into him. There is a superior intelligence bestowed upon such as obey the Gospel with full purpose of heart, which, if sinned against, the apostate is left naked and destitute of the Spirit of God, and he is, in truth, nigh unto cursing, and his end is to be burned. When once that light which was in them is taken from them, they become as much darkened as they were previously enlightened, and then, no marvel, if all their power should be enlisted against the truth, and they, Judas like, seek the destruction of those who were their greatest benefactors.
Author: Joseph Smith
Source: Teaching of the Prophet Joseph Smith, pg 67