"Keep on being filled with the spirit." ( Ephesians 5:18)
If we refuse to do that -or neglect to do that- we are not in danger of being cast away eternally, but we are in danger of being set aside as an instrument God cannot use. -Vernon Grounds, Radical Commitment: Getting Serious About Christian Growth
Being filled with the spirit allows God to produce the Fruits of the Spirit in your life. It is like like Raj Koothrappali from The Big Bang Theory. After many sips he now has courage, well we as Christians should not get drunk with wine but of the spirit. When you allow this to happen you experience the same boldness and joy as the early church. The courage nd the power. The same fruits needed to be UNASHAMED of the Gospel of Jesus Christ, which is the power of God for salvation to everyone who believes.