R’ Reuven Elitzur Karlenstein zt”l (Yechi Reuven) would say: “'איה שרה אשתך' - When the angels realized that Sarah was inside the tent, they said, ‘Behold, she is in the tent.’ Rashi uses these words to point out Sarah’s trait of modesty. Why is the fact that she was in the tent proof of her modesty? We are told that on that day Hashem took the sun out of its cover. Would anyone think of stepping outside on such a boiling hot day? The very fact that even with the angels being inside the same tent as Sarah they did not see her, is a proof of her modesty for even within her home she kept herself out of sight when there were foreign people around.”
A Wise Man would say: “My feelings are too loud for words and too shy for the world.”