Dear Rina,

    I've spent several days in San Francisco and I'm still not tired of this city. People in San Francisco are friendly and helpful.

    I have an interesting story about that. It happened the day after my mother and I arrived in San Francisco. My father took us sightseeing in rented car, We arrived at this beautiful spot where you can see the view of the bay from the top of the steps, which seem to reach all the way down the hill.

    My dad stayed in the car while my mum and I got out of the car to take pictures. We were taking turns posing and taking pictures when I spotted a man in his sport gear, carrying his bicycle, climbing the steep steps. I was fascinated by the man and kept on watching him as he finishes his ascent, gasping for air. But, we were slightly surprised when he suddenly approached us and extended his hand as if asking for our camera.

    We thought he was going to harm us, since he was still breathing heavily and could not say a word. Moreover, he looked so menacing with those cycling-glasses. But then he explained, with gesture, that he just wanted to help us take care of pictures. Oh, thank God! So we gave him our camera and let him take our pictures. I'm still a bit ashamed when I think of it. We had misjudged that stranger. As it turned out, he only wanted to help us. Well, let that be a lesson! Don't judge a book by its cover and don't always think negatively of stranger.

    Well, that's all for now. I'll be back to Indonesia next week with lots of pictures and stories.

Love,

Nindya

Answer these question in short answer!

"Don't judge a book by its cover."

What is the meaning of the sentence above?