One of the first major differences between Catholicism and Protestantism is the issue of the sufficiency and authority of Scripture. Protestants believe that the Bible alone is the source of God’s special revelation to mankind and teaches us all that is necessary for our salvation from sin. Protestants view the Bible as the standard by which all Christian behavior must be measured. This belief is commonly referred to as “sola scriptur” and is one of the “five solas” (sola is Latin for “alone”) that came out of the Protestant Reformation as summaries of some of the differences between Catholics and Protestants.