10 For 1with the heart there is believing 2unto righteousness, and 1with the mouth there is confession 2unto salvation.
101 To believe with the heart is toward God; to confess with the mouth is toward man. To believe with the heart is to believe in Christ, who was glorified and raised by God from the dead; to confess with the mouth is to confess that Jesus, who was despised and rejected by man, is Lord. Both are conditions for our being justified and saved.

