His translation of the Bible also helped to develop a standard version of the German language and added several principles to the art of translation. Luther's hymns sparked the development of congregational singing in Christianity. His marriage, on June 13, 1525, to Katharina von Bora, a former nun, began the tradition of clerical marriage within several Christian traditions. According to his father's wishes, Martin enrolled in the law school of that university. All that changed during a thunderstorm in the summer of 1505. A lightening bolt struck near to him as he was returning to school. Terrified, he cried out, "Help, St. Anne! I'll become a monk!" Spared of his life, but regretting his words, Luther kept his bargain, dropped out of law school and entered the monastery there.
The demands of study for academic degrees and preparation for delivering lectures drove Martin Luther to study the Scriptures in depth. Luther immersed himself in the teachings of the Scripture and the early church. Slowly, terms like penance and righteousness took on new meaning. The controversy that broke loose with the publication of his 95 Theses placed even more pressure on the reformer to study the Bible. This study convinced him that the Church had lost sight of several central truths. To Luther, the most important of these was the doctrine that brought him peace with God.
With joy, Luther now believed and taught that salvation is a gift of God's grace, received by faith and trust in God's promise to forgive sins for the sake of Christ's death on the cross. This, he believed was God's work from beginning to end
Luther's Protestant views were condemned as heretical by Pope Leo X in the bull Exsurge Domine in 1520. Consequently Luther was summoned to either renounce or reaffirm them at the Diet of Worms on 17 April 1521. When he appeared before the assembly, Johann von Eck, by then assistant to the Archbishop of Trier, acted as spokesman for Emperor Charles the Fifth. He presented Luther with a table filled with copies of his writings. Eck asked Luther if he still believed what these works taught. He requested time to think about his answer. Granted an extension, Luther prayed, consulted with friends and mediators and presented himself before the Diet the next day.
Luther had powerful friends among the princes of Germany, one of whom was his own prince, Frederick the Wise, Elector of Saxony. The prince arranged for Luther to be seized on his way from the Diet by a company of masked horsemen, who carried him to the castle of the Wartburg, where he was kept about a year. He grew a wide flaring beard; took on the garb of a knight and assumed the pseudonym Jörg. During this period of forced sojourn in the world, Luther was still hard at work upon his celebrated translation of the Bible, though he couldn't rely on the isolation of a monastery. During his translation, Luther would make forays into the nearby towns and markets to listen to people speak, so that he could put his translation of the Bible into the language of the people.

Although his stay at the Wartburg kept Luther hidden from public view, Luther often received letters from his friends and allies, asking for his views and advice. For example, Luther’s closest friend, Philipp Melanchthon, wrote to him and asked how to answer the charge that the reformers neglected pilgrimages, fasts and other traditional forms of piety. Luther's replied: "If you are a preacher of mercy, do not preach an imaginary but the true mercy. If the mercy is true, you must therefore bear the true, not an imaginary sin. God does not save those who are only imaginary sinners. Be a sinner, and let your sins be strong, but let your trust in Christ be stronger, and rejoice in Christ who is the victor over sin, death, and the world. We will commit sins while we are here, for this life is not a place where justice resides. We, however, says Peter (2. Peter 3:13) are looking forward to a new heaven and a new earth where justice will reign." [Letter 99.13, To Philipp Melanchthon, 1 August 1521.]
Luther also wrote the bible in german.