This was taken from John Piper's sermon on Galatians 1:6-10 entitled "When Not to Believe an Angel". Piper's challenge to his church is to not be babes in their thinking but to think and think hard about the essential and foundational doctrines of Christianity. The gospel is something that as Christians we must be clear on. Heresy and false teaching are very real threats to the church that often arise not from outside of the church but from the inside. Our experiences and feelings as Christians should never be elevated above or replace our thinking about the gospel or foundational Christian teachings.