“be filled with the Spirit” (Ephesians 5:18) is to be controlled by the Holy Spirit. This is a present continuous action and requires a believer to be (a) daily yielded to God, (b) daily in repentance with confession with godly sorrow, (c) daily allowing the word of God to richly indwell the inner man. Being controlled by the Holy Spirit empowers a believer (a) daily in spiritual battle (Spirit versus flesh) and, (b) daily in living out the person and character and conduct of Christ and in being obedient to the will of God.
The double minded man is unstable in all his ways. We live each day in a war, the flesh against the Spirit. We will be unstable in all our ways if we do not submit ourselves to God. He gives the spirit of wisdom; the spirit of understanding; the spirit of counsel; the spirit of strength; the spirit of knowledge, and the spirit of the fear of the Lord. These are brought about from within us, for the Spirit of God makes His dwelling within us. They are not tacked on from the outside. Full submission of our heart to God is the beginning.