Peter erred in life and in doctrine. Paul might have dismissed Peter's error as a matter of no consequence. But Paul saw that Peter's error would lead to the damage of the whole Church unless it were corrected. Therefore he withstood Peter to his face. The Church, Peter, the apostles, angels from heaven, are not to be heard unless they teach the genuine Word of God.
Martin LutherTemptations, of course, cannot be avoided, but because we cannot prevent the birds from flying over our heads, there is no need that we should let them nest in our hair.
Martin LutherTake a look at your own heart, and you will soon find out what has stuck to it and where your treasure is. It is easy to determine whether hearing the Word of God, living according to it, and achieving such a life gives you as much enjoyment and calls forth as much diligence from you as does accumulating and saving money and property.
Martin Luther