Both sanctification and the sonship are always carried out by the Spirit. This is why Ephesians 1:3 calls this a spiritual blessing, a blessing by the Spirit. Today we must learn to live by the Spirit, to act according to the Spirit, to have our being altogether by the Spirit, with the Spirit, and according to the Spirit (Rom. 8:4). As long as we have our being by the Spirit and act according to the Spirit, we are ready to grow in the divine life. Then we need some nourishment. We can be nourished in these three ways: by reading the holy Word, by listening to the spiritual speaking, and by coming to the meetings. This nourishment causes us to grow.
Sanctification for sonship is still going on. Day by day, however, we do not live in our sonship, because we do not care for the sanctifying Spirit speaking and working in our spirit. We must turn to our spirit, realizing that we have been sanctified and regenerated by the Spirit. This sanctifying and regenerating Spirit has much to say to us. He still wants to sanctify us more and more that we may participate in the sonship more and more. Then we will grow, and the Father will have a pleasant household….The blessings in Ephesians 1 start from God’s choosing for us to be sanctified that we might be more and more in the sonship of God. This should be a daily matter. (The Issue of the Dispensing of the Processed Trinity and the Transmitting of the Transcending Christ, ch. 1, by Witness Lee)