"While Peter was wondering about the meaning of the vision, the men sent by Cornelius found out where Simon's house was and stopped at the gate. They called out, asking if Simon who was known as Peter was staying there. While Peter was still thinking about the vision, the Spirit said to him, 'Simon, three men are looking for you. So get up and go downstairs. Do not hesitate to go with them, for I have sent them.' Peter went down and said to the men, 'I'm the one you are looking for. Why have you come?'" NIV translation
What a great example of faith and obedience we see in this passage. We see that, even though Peter did not understand what God was showing him through the vision, he obeyed the Spirit and went down to greet the men. Most of the time we will not understand all of what God is doing but, like Peter, we need to obey when He tells us to do something and trust that God is in control of everything.