"If you openly declare that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. For it is by believing in your heart that you are made right with God, and it is by openly declaring your faith that you are saved."

(Romans 10.9-10 NLT)

To "openly declare" can mean different things to different believers. And to some, the implications are much more significant than others. "Openly declare" is something that ought to come from within - inspired by the Holy Spirit to accomplish God's plan.

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See: Worth dying for