One of the Puritans' most important beliefs was that every person needed to understand the Bible in his own way. (This belief is shared among most Protestants.) Puritans tried to live by the Bible's teachings in every way. They tried to be morally pure in even the smallest ways. They also tried to be spiritually pure in every way. They thought that man existed for the glory of God. They believed that man's most important job in life was to do God's will (what God wanted). By doing God's will, man would be rewarded with happiness in the future.