What are the effects of ignoring lessons from the Reformation?

Michael Beasley explains in this video that one of the great lessons that we can learn from the Reformation is witnessing human frailty and sin and the danger of complacency. When you look at what led to the Reformation and understand how Scripture was abandoned at that time, it was essentially a repeat of what we saw in the first century when Jesus was on earth.

Pharisees exalted man-made tradition, similar to how the Roman Catholic Church did during the time of the Reformation. The Reformation teaches us the simple lesson that there is no "cruise control" for the Christian or the Church. At the moment we start trusting ourselves and think we’re not prone to error, it is a very dangerous moment and could lead to all sorts of corruption.

Romans 15:4 (NKJV) – “ For whatever things were written before were written for our learning, that we through the patience and comfort of the Scriptures might have hope.” 

I think that one of the great lessons that we do learn from the Reformation, the Protestant Reformation, is something about human frailty and sin. When you look at the history of what led to the Reformation and the manner in which the Gospel was abandoned, the Scriptures were abandoned, oral traditions of men were exalted, Really in many respects it was a repeat. The years leading up to the Reformation were a repeat of what we saw in the first century when Jesus walked this earth and ministered to the multitudes. You had the Pharisees who were exalting man-made tradition and were abandoning and nullifying the scriptures in the process. So I look at the Reformation and all such similar events and I believe that it is a lesson and a warning to us that there is no cruise control in Christianity.

That we need to be vigilant and careful and guardians of the things that have been entrusted to us. For our generation and generations to come, we need to take away the lessons of the Reformation and understand that the moment we start trusting ourselves and the moment we think that we're not prone to error or repeating the errors of the past, that is a very dangerous moment and it leads to all kinds of corruption.