Notice Peter's situation in Acts chapter 10. Look at the circumstances that would have made him uncomfortable. The close of chapter 9 has Peter staying at the home of a tanner. We think, so what? What does it matter where he stayed? Well, here's something you may not know about a tanner in the first century. A tanner was a leather worker - they made stuff with leather. And back then, they didn't buy the leather then turn it into purses, sandals and jackets. They had it from start to finish. Think bloody, nasty, smelly, etc. The Jews didn't think much of them because of this. That's understandable because the Jews were so interested in cleanliness. Then after God had Peter staying with a tanner, he sent him to a gentile's home! That never happened. A good Jew might let a gentile stay in his house if he needed to, but never the opposite. This was a social perception issue and a religious issue - the cleanliness thing again. In a matter of two days, Peter went from uncomfortable to really uncomfortable. Why? For what? You know why. Because he was called to a higher purpose. What would have happened if Peter had refused to leave his comfort zone. What if he said no thanks and never went? How many souls did Peter impact because he chose the Lord over himself?
How comfortable are you?