This is a tough question to answer. You want to give a substantive comment, rather than a basic "I can see that you are very dedicated." See if you can bring in knowledge that you learned about the company during your first interview. Also, consider rephrasing the mission statement using specific product examples. For example, if the mission statement is "to develop innovative B2B solutions," then your answer "I can see that you and your staff are dedicated to producing technologically advanced tools such as product X and product Y in order to meet the needs of modern and future businesses. After meeting Person Z and Person Q, I can tell that the entire department is organized to help meet those goals, and it appears to me that this is an environment with a clear path ahead of it."