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In this verse, Paul tells us what we must do to have the wonderful grace of God applied to our lives and be saved. We must confess with our mouths and believe in our hearts that God raised Jesus from the dead, and we will be saved. The key word here is "believe". This is one example of where English falls short of the depth of meaning of the Greek word. The English word emphasizes the intellectual aspect of faith, i.e. believe in the fact that God raised Jesus from the dead. The Greek however implies that the person who believes intellectually will also entrust themselves to the facts they have accepted. In other words, when Paul writes "believes in their hearts...", in the Greek he is saying that the person upon believing that God raised Jesus from the dead will live their lives in a manner that shows they are trusting in that fact. Because the English does not carry the meaning of trust within the word believe, that aspect is often lost within the church today. But those who truly do believe and accept the fact of Jesus' death on the cross cannot help but change the course of their lives. They will naturally want to share the Good News, and out of thankfulness to God, want to live their lives in service to others.