Human beings are creatures of emotion. Although it may differ by individual, we all betray our feelings and thoughts in various ways. In sadness it is common to cry tears, or at the very least a fallen countenance. In happiness a smile, a grin, even a laugh. When embarrassed, it is common for a rush of blood to flood the cheeks creating a blush.
When writing to the Christians in Rome, Paul the apostle told these Christians about his plans to visit them. The primary force for this visit was what he called his own “obligation” to preach to the Gentile world, whether they would accept his message or not (Rom. 1:14). This was driven by these important words:
For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. Rom. 1:16 (NASU)