Therefore, as for you, let that remain in you which you heard from the beginning. If that which you heard from the beginning remains in you, you also will remain in the Son, and in the Father.
In that which ye have heard Here is the fruit of perseverance, that they in whom God’s truth remains, remain in God. We hence learn what we are to seek in every truth pertaining to religion. He therefore makes the greatest proficiency, who makes such progress as wholly to cleave to God. But he in whom the Father dwells not through his Son, is altogether vain and empty, whatever knowledge he may possess. Moreover, this is the highest commendation of sound doctrine, that it unites us to God, and that in it is found whatever pertains to the real fruition of God. 