What's wrong with this sentence?
Why is inappropriate to say this following sentence?
校長先生のお話を聞いて感心しました
Then what's the right or polite way to say it?
Thank you inadvance.

Question

What's wrong with this sentence?
Why is inappropriate to say this following sentence?
 校長先生のお話を聞いて感心しました 
Then what's the right or polite way to say it?
Thank you inadvance.

Answer

質問を答えてくれてありがとうございます(^-^)

Answer

校長先生のお話を聞いて感銘（かんめい）を受けました。
is better.

To be exact, ”感心しました” should be used only from seniors to juniors.