It is a proverb and it means "seeing is believing". It is used to say that what you see once is more important than what you hear many times.
Ken is searching for a watch online.
- Ken : There are so many watches that I like, but these two are the most interesting for me.
気に入った時計が沢山あるけど、この二つに絞ったたぞ。 - Leo : Both look cool. Then which are you going to buy?
両方格好良いね。それで、どっちを買うの？ - Ken : I'm still thinking of it. The more I read the customer reviews, the more I'm confused.
まだ考え中。レビューを読めば読むほど、迷うな。 - Leo : I guess seeing is believing. Why don't you go to a brick-and-mortar store near the station?
百聞は一見にしかず。駅の近くの店に、見に行ったら？
Amy and Meg are gossiping.
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- Amy : Have you met a new hire working on the 5th floor yet? He is so hot.
- 5階で働いている新人に、もう会った？
- Meg : No. I often go there but I've never found a handsome guy. I don't think that the guy is as good looking as everyone says.
ううん。よく5階に行くんだけど、格好良い人なんて見た事ない。皆が言うほど、格好良くないんじゃないかな。 - Amy : I can't quite figure out what it is, but there is something about him that I like. I can't explain it. Oh, I have his photo!
何て言っていいか分からないけど、何か格好良いの。説明できないな。あっ、この写真見て！ - Meg : Let me see....wow, he is actually charming. A picture is worth a thousand words.
どれ...えっ、格好良いね。百聞は一見にしかずだね。