Because if you acknowledge and confess with your lips that Jesus is Lord and in your heart believe (adhere to, trust in, and rely on the truth) that God raised Him from the dead, you will be saved. For with the heart a person believes (adheres to, trusts in, and relies on Christ) and so is justified (declared righteous, acceptable to God), and with the mouth he confesses (declares openly and speaks out freely his faith) and confirms [his] salvation.- Romans 10:9-10
This is a very important principle that we are in danger of missing. We are saved by faith, but James said that faith without works is dead. I can believe in my heart that God is worthy of worship; but if I don’t take action to worship Him, it doesn’t do much good. I can say I believe in tithing; but if I don’t tithe, it won’t help me financially.
Be bold—take some action and be expressive in your praise and worship. A lot of people even refuse to talk about God. They say, “Religion is a private thing.” I cannot find anyone in the Bible who met Jesus and kept it private.
When we are excited about praising and worshiping Him, it is difficult to have no outward expression. When He fills our hearts, the good news about Him comes out of our mouths.