What is faith? It is the confident assurance that something we want is going to happen. It is the certainty that what we hope for is waiting for us, even though we cannot see it up ahead. – Hebrews 11:1
Jesus noted that His true worshipers will worship in spirit and in truth (John 4:23-24). This includes both accurate (truth) and expressive (spirit) worship, including loving the Lord with all of a person's heart, soul, mind, and strength (Matthew 22:36-40; Mark 12:28-34).
"Expressive" worship does not mean that worship must be loud nor does it indicate any particular physical posture. It simply means that worship comes from our spirits and involves our being (heart, soul, mind, and strength); it is something we express.
Worship includes both a personal and communal aspect and the goal of worship is to honor God. Philippians 2:9-11 says, "Therefore God has highly exalted him and bestowed on him the name that is above every name, so that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father."