Thankfulness and anticipation are two essential parts of worship. The first reason is that both are active. Worship can never be passive. Through the Holy Spirit each believer actively gives their body (including their voice) to celebrating God. Worship was never intended to be a passive event. When we are thankful we are actively engaging in acknowledging God's activity in our live over the past week. So often we ignore the work of God in our lives; we don't even recognize what gifts God has given us. This often leads to believing that God isn't in their lives or is not concerned about their life - nothing could be further from the truth. When a Christian is thankful, worship begins to take on its correct contour and shape. Worship grows out of thankfulness.
Secondly, worship grows out of anticipation. Anticipation is an acknowledgement that God has done big things in the past and that He is able and willing to do them in the future. Anticipation is expecting God to act in our lives. When we anticipate God working in our lives our we are naturally led to thankfulness for what God will do. Worship fully takes on its contour and shape with the combination of thankfulness and anticipation.
This Sunday, don't come to worship EXPECTING something to be given to you. Worship is a celebration when YOU bring something to worship. The first place to start is being thankful for what God has done and begin to anticipate what God will do in the coming weeks!